diff --git a/swh/web/assets/config/webpack-plugins/fix-swh-source-maps-webpack-plugin.js b/swh/web/assets/config/webpack-plugins/fix-swh-source-maps-webpack-plugin.js
new file mode 100644
index 00000000..8cfcb2ab
--- /dev/null
+++ b/swh/web/assets/config/webpack-plugins/fix-swh-source-maps-webpack-plugin.js
@@ -0,0 +1,43 @@
+/**
+ * Copyright (C) 2019  The Software Heritage developers
+ * See the AUTHORS file at the top-level directory of this distribution
+ * License: GNU Affero General Public License version 3, or any later version
+ * See top-level LICENSE file for more information
+ */
+
+'use strict';
+
+// This plugin modifies the generated asset sourcemaps on the fly
+// in order to be successfully loaded by Firefox.
+// The following error is reported without that:
+// Source map error: TypeError: Invalid URL: webpack://swh.[name]/...
+
+class FixSwhSourceMapsPlugin {
+
+  constructor() {
+    this.sourceMapRegexp = /\.map($|\?)/i;
+  }
+
+  apply(compiler) {
+    compiler.hooks.afterCompile.tap('FixSwhSourceMapsPlugin', compilation => {
+      Object.keys(compilation.assets).filter(key => {
+        return this.sourceMapRegexp.test(key);
+      }).forEach(key => {
+        let bundleName = key.replace(/^js\//, '');
+        bundleName = bundleName.replace(/^css\//, '');
+        let pos = bundleName.indexOf('.');
+        bundleName = bundleName.slice(0, pos);
+        let asset = compilation.assets[key];
+        let source = asset.source().replace(/swh.\[name\]/g, 'swh.' + bundleName);
+        compilation.assets[key] = Object.assign(asset, {
+          source: () => {
+            return source;
+          }
+        });
+      });
+    });
+  }
+
+};
+
+module.exports = FixSwhSourceMapsPlugin;
diff --git a/swh/web/assets/config/webpack-plugins/remove-source-map-url-webpack-plugin.js b/swh/web/assets/config/webpack-plugins/remove-source-map-url-webpack-plugin.js
deleted file mode 100644
index 1ee77566..00000000
--- a/swh/web/assets/config/webpack-plugins/remove-source-map-url-webpack-plugin.js
+++ /dev/null
@@ -1,56 +0,0 @@
-/**
- * Copyright (C) 2018  The Software Heritage developers
- * See the AUTHORS file at the top-level directory of this distribution
- * License: GNU Affero General Public License version 3, or any later version
- * See top-level LICENSE file for more information
- */
-
-// Adapted and ported to Webpack 4 from
-// https://github.com/rbarilani/remove-source-map-url-webpack-plugin
-// Enable to remove source map url annotation embedded in vendor modules.
-// The purpose is to remove warnings in js console after bundling them with webpack.
-
-'use strict';
-
-class RemoveSourceMapURLWebpackPlugin {
-
-  constructor(opts) {
-    this.options = opts || {};
-    this.options.test = this.options.test || /\.js($|\?)/i;
-  }
-
-  testKey(key) {
-    if (this.options.test instanceof RegExp) {
-      return this.options.test.test(key);
-    }
-
-    if (typeof this.options.test === 'string') {
-      return this.options.test === key;
-    }
-
-    if (typeof this.options.test === 'function') {
-      return this.options.test(key);
-    }
-
-    throw new Error(`remove-source-map-url: Invalid "test" option. May be a RegExp (tested against asset key), a string containing the key, a function(key): bool`);
-  }
-
-  apply(compiler) {
-    compiler.hooks.afterCompile.tap('RemoveSourceMapUrlPlugin', compilation => {
-      Object.keys(compilation.assets).filter(key => {
-        return this.testKey(key);
-      }).forEach(key => {
-        let asset = compilation.assets[key];
-        let source = asset.source().replace(/# sourceMappingURL=(.*\.map)/g, '# $1');
-        compilation.assets[key] = Object.assign(asset, {
-          source: () => {
-            return source;
-          }
-        });
-      });
-    });
-  }
-
-};
-
-module.exports = RemoveSourceMapURLWebpackPlugin;
diff --git a/swh/web/assets/config/webpack.config.development.js b/swh/web/assets/config/webpack.config.development.js
index 86765a79..c590b65e 100644
--- a/swh/web/assets/config/webpack.config.development.js
+++ b/swh/web/assets/config/webpack.config.development.js
@@ -1,406 +1,406 @@
 /**
  * Copyright (C) 2018-2019  The Software Heritage developers
  * See the AUTHORS file at the top-level directory of this distribution
  * License: GNU Affero General Public License version 3, or any later version
  * See top-level LICENSE file for more information
  */
 
 // webpack configuration for compiling static assets in development mode
 
 // import required node modules and webpack plugins
 const fs = require('fs');
 const path = require('path');
 const webpack = require('webpack');
 const BundleTracker = require('webpack-bundle-tracker');
 const RobotstxtPlugin = require('robotstxt-webpack-plugin');
 const CleanWebpackPlugin = require('clean-webpack-plugin');
 const MiniCssExtractPlugin = require('mini-css-extract-plugin');
-const RemoveSourceMapUrlPlugin = require('./webpack-plugins/remove-source-map-url-webpack-plugin');
+const FixSwhSourceMapsPlugin = require('./webpack-plugins/fix-swh-source-maps-webpack-plugin');
 const CopyWebpackPlugin = require('copy-webpack-plugin');
 const GenerateWebLabelsPlugin = require('./webpack-plugins/generate-weblabels-webpack-plugin');
 
 // are we running webpack-dev-server ?
 const isDevServer = process.argv.find(v => v.includes('webpack-dev-server'));
 // webpack-dev-server configuration
 const devServerPort = 3000;
 const devServerPublicPath = 'http://localhost:' + devServerPort + '/static/';
 // set publicPath according if we are using webpack-dev-server to serve
 // our assets or not
 const publicPath = isDevServer ? devServerPublicPath : '/static/';
 
 const nodeModules = path.resolve(__dirname, '../../../../node_modules/');
 
 // collect all bundles we want to produce with webpack
 var bundles = {};
 const bundlesDir = path.join(__dirname, '../src/bundles');
 fs.readdirSync(bundlesDir).forEach(file => {
   bundles[file] = ['bundles/' + file + '/index.js'];
 });
 
 // common loaders for css related assets (css, sass, less)
 let cssLoaders = [
   MiniCssExtractPlugin.loader,
   {
     loader: 'cache-loader'
   },
   {
     loader: 'css-loader',
     options: {
       sourceMap: !isDevServer
     }
   },
   {
     loader: 'postcss-loader',
     options: {
       ident: 'postcss',
       sourceMap: !isDevServer,
       plugins: [
         // lint swh-web stylesheets
         require('stylelint')({
           'config': {
             'extends': 'stylelint-config-standard',
             'rules': {
               'indentation': 4,
               'font-family-no-missing-generic-family-keyword': null,
               'no-descending-specificity': null
             },
             'ignoreFiles': ['node_modules/**/*.css',
                             'swh/web/assets/src/thirdparty/**/*.css']
           }
         }),
         // automatically add vendor prefixes to css rules
         require('autoprefixer')(),
         require('postcss-normalize')()
       ]
     }
   }
 ];
 
 // webpack development configuration
 module.exports = {
   // use caching to speedup incremental builds
   cache: true,
   // set mode to development
   mode: 'development',
   // use eval source maps when using webpack-dev-server for quick debugging,
   // otherwise generate source map files (more expensive)
   devtool: isDevServer ? 'eval' : 'source-map',
   // webpack-dev-server configuration
   devServer: {
     clientLogLevel: 'warning',
     port: devServerPort,
     publicPath: devServerPublicPath,
     // enable to serve static assets not managed by webpack
     contentBase: path.resolve('./swh/web/'),
     // we do not use hot reloading here (as a framework like React needs to be used in order to fully benefit from that feature)
     // and prefere to fully reload the frontend application in the browser instead
     hot: false,
     inline: true,
     historyApiFallback: true,
     headers: {
       'Access-Control-Allow-Origin': '*'
     },
     compress: true,
     stats: {
       colors: true
     },
     overlay: {
       warnings: true,
       errors: true
     }
   },
   // set entries to the bundles we want to produce
   entry: bundles,
   // assets output configuration
   output: {
     path: path.resolve('./swh/web/static/'),
     filename: 'js/[name].[chunkhash].js',
     chunkFilename: 'js/[name].[chunkhash].js',
     publicPath: publicPath,
     // each bundle will be compiled as a umd module with its own namespace
     // in order to easily use them in django templates
     library: ['swh', '[name]'],
     libraryTarget: 'umd'
   },
   // module resolving configuration
   resolve: {
     // alias pdfjs to its minified version
     alias: {
       'pdfjs-dist': 'pdfjs-dist/build/pdf.min.js'
     },
     // configure base paths for resolving modules with webpack
     modules: [
       'node_modules',
       path.resolve(__dirname, '../src')
     ]
   },
   // module import configuration
   module: {
     rules: [
       {
       // Preprocess all js files with eslint for consistent code style
       // and avoid bad js development practices.
         enforce: 'pre',
         test: /\.js$/,
         exclude: /node_modules/,
         use: [{
           loader: 'eslint-loader',
           options: {
             configFile: path.join(__dirname, '.eslintrc'),
             ignorePath: path.join(__dirname, '.eslintignore'),
             emitWarning: true
           }
         }]
       },
       {
       // Use babel-loader in order to use es6 syntax in js files
       // but also advanced js features like async/await syntax.
       // All code get transpiled to es5 in order to be executed
       // in a large majority of browsers.
         test: /\.js$/,
         exclude: /node_modules/,
         use: [
           {
             loader: 'cache-loader'
           },
           {
             loader: 'babel-loader',
             options: {
               presets: [
                 // use env babel presets to benefit from es6 syntax
                 ['@babel/preset-env', {
                   // Do not transform es6 module syntax to another module type
                   // in order to benefit from dead code elimination (aka tree shaking)
                   // when running webpack in production mode
                   'loose': true,
                   'modules': false
                 }]
               ],
               plugins: [
               // use babel transform-runtime plugin in order to use aync/await syntax
                 ['@babel/plugin-transform-runtime', {
                   'corejs': 2,
                   'regenerator': true
                 }],
                 // use other babel plugins to benefit from advanced js features (es2017)
                 '@babel/plugin-syntax-dynamic-import'
               ]
             }
           }]
       },
       // expose jquery to the global context as $ and jQuery when importing it
       {
         test: require.resolve('jquery'),
         use: [{
           loader: 'expose-loader',
           options: 'jQuery'
         }, {
           loader: 'expose-loader',
           options: '$'
         }]
       },
       // expose highlightjs to the global context as hljs when importing it
       {
         test: require.resolve('highlight.js'),
         use: [{
           loader: 'expose-loader',
           options: 'hljs'
         }]
       },
       {
         test: require.resolve('js-cookie'),
         use: [{
           loader: 'expose-loader',
           options: 'Cookies'
         }]
       },
       // css import configuration:
       //  - first process it with postcss
       //  - then extract it to a dedicated file associated to each bundle
       {
         test: /\.css$/,
         use: cssLoaders
       },
       // sass import configuration:
       //  - generate css with sass-loader
       //  - process it with postcss
       //  - then extract it to a dedicated file associated to each bundle
       {
         test: /\.scss$/,
         use: cssLoaders.concat([
           {
             loader: 'sass-loader',
             options: {
               sourceMap: !isDevServer
             }
           }
         ])
       },
       // less import configuration:
       //  - generate css with less-loader
       //  - process it with postcss
       //  - then extract it to a dedicated file associated to each bundle
       {
         test: /\.less$/,
         use: cssLoaders.concat([
           {
             loader: 'less-loader',
             options: {
               sourceMap: !isDevServer
             }
           }
         ])
       },
       // web fonts import configuration
       {
         test: /\.(woff|woff2)(\?v=\d+\.\d+\.\d+)?$/,
         use: [{
           loader: 'file-loader',
           options: {
             name: '[name].[ext]',
             outputPath: 'fonts/'
           }
         }]
       }, {
         test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/,
         use: [{
           loader: 'file-loader',
           options: {
             name: '[name].[ext]',
             outputPath: 'fonts/'
           }
         }]
       }, {
         test: /\.eot(\?v=\d+\.\d+\.\d+)?$/,
         use: [{
           loader: 'file-loader',
           options: {
             name: '[name].[ext]',
             outputPath: 'fonts/'
           }
         }]
       }, {
         test: /\.svg(\?v=\d+\.\d+\.\d+)?$/,
         use: [{
           loader: 'file-loader',
           options: {
             name: '[name].[ext]',
             outputPath: 'fonts/'
           }
         }]
       }, {
         test: /\.otf(\?v=\d+\.\d+\.\d+)?$/,
         use: [{
           loader: 'file-loader',
           options: {
             name: '[name].[ext]',
             outputPath: 'fonts/'
           }
         }]
       }
     ],
     // tell webpack to not parse minified pdfjs file to speedup build process
     noParse: [path.resolve(nodeModules, 'pdfjs-dist/build/pdf.min.js')]
   },
   // webpack plugins
   plugins: [
     // cleanup previously generated assets
     new CleanWebpackPlugin(['static/css', 'static/js', 'static/fonts',
                             'static/jssources', 'static/*.*'], {
       root: path.resolve(__dirname, '../../')
     }),
     // needed in order to use django_webpack_loader
     new BundleTracker({
       filename: './swh/web/static/webpack-stats.json'
     }),
     // for generating the robots.txt file
     new RobotstxtPlugin({
       policy: [{
         userAgent: '*',
         disallow: '/api/'
       }]
     }),
     // for extracting all stylesheets in separate css files
     new MiniCssExtractPlugin({
       filename: 'css/[name].[chunkhash].css',
       chunkFilename: 'css/[name].[chunkhash].css'
     }),
-    // for removing some warnings in js console about not found source maps
-    new RemoveSourceMapUrlPlugin(),
+    // fix generated asset sourcemaps to workaround a Firefox issue
+    new FixSwhSourceMapsPlugin(),
     // define some global variables accessible from js code
     new webpack.DefinePlugin({
       __STATIC__: JSON.stringify(publicPath)
     }),
     // needed in order to use bootstrap 4.x
     new webpack.ProvidePlugin({
       Popper: ['popper.js', 'default'],
       Alert: 'exports-loader?Alert!bootstrap/js/dist/alert',
       Button: 'exports-loader?Button!bootstrap/js/dist/button',
       Carousel: 'exports-loader?Carousel!bootstrap/js/dist/carousel',
       Collapse: 'exports-loader?Collapse!bootstrap/js/dist/collapse',
       Dropdown: 'exports-loader?Dropdown!bootstrap/js/dist/dropdown',
       Modal: 'exports-loader?Modal!bootstrap/js/dist/modal',
       Popover: 'exports-loader?Popover!bootstrap/js/dist/popover',
       Scrollspy: 'exports-loader?Scrollspy!bootstrap/js/dist/scrollspy',
       Tab: 'exports-loader?Tab!bootstrap/js/dist/tab',
       Tooltip: 'exports-loader?Tooltip!bootstrap/js/dist/tooltip',
       Util: 'exports-loader?Util!bootstrap/js/dist/util'
     }),
     // needed in order to use pdf.js
     new webpack.IgnorePlugin(/^\.\/pdf.worker.js$/),
     new CopyWebpackPlugin([{
       from: path.resolve(nodeModules, 'pdfjs-dist/build/pdf.worker.min.js'),
       to: path.resolve(__dirname, '../../static/js/')
     }]),
     new GenerateWebLabelsPlugin({
       outputType: 'json',
       exclude: ['mini-css-extract-plugin',
                 'bootstrap-loader'],
       srcReplace: {
         './node_modules/pdfjs-dist/build/pdf.min.js':
         './node_modules/pdfjs-dist/build/pdf.js',
         './node_modules/admin-lte/dist/js/adminlte.min.js':
         './node_modules/admin-lte/dist/js/adminlte.js'
       },
       licenseOverride: {
         './swh/web/assets/src/thirdparty/highlightjs-line-numbers/highlightjs-line-numbers.js': {
           'spdxLicenseExpression': 'MIT',
           'licenseFilePath': './swh/web/assets/src/thirdparty/highlightjs-line-numbers/LICENSE'
         },
         './swh/web/assets/src/thirdparty/jquery.tabSlideOut/jquery.tabSlideOut.js': {
           'spdxLicenseExpression': 'GPL-3.0',
           'licenseFilePath': './swh/web/assets/src/thirdparty/jquery.tabSlideOut/LICENSE'
         }
       },
       additionalScripts: {
         'js/pdf.worker.min.js': [
           {
             'id': 'pdfjs-dist/build/pdf.worker.js',
             'path': './node_modules/pdfjs-dist/build/pdf.worker.js',
             'spdxLicenseExpression': 'Apache-2.0',
             'licenseFilePath': './node_modules/pdfjs-dist/LICENSE'
 
           }
         ]
       }
     })
   ],
   // webpack optimizations
   optimization: {
     // ensure the vendors bundle gets emitted in a single chunk
     splitChunks: {
       cacheGroups: {
         vendors: {
           test: 'vendors',
           chunks: 'all',
           name: 'vendors',
           enforce: true
         }
       }
     }
   },
   // disable webpack warnings about bundle sizes
   performance: {
     hints: false
   }
 };