If the variable is not going to get modified, it is better to declare it with const instead of let

Here I would rather write:

let response;
fetch(searchUrl)
 .then(handleFetchError)
 .then(resp => {
   response = resp;
   return resp.json();
  })
 .then(data => {

Feels more readable to me.

s/backword/backward/

You should add a visit to each origin (pointing to the empty snapshot for instance).

When executing cypress tests for origins search, the api/1/origin/(origin_url)/visit/latest/ endpoint will be
queried for each origin and currently all requests end up with 404. This is not critical but this generates
a lot of noise in cypress logs.