ideas to improve LibreJS browser ext.

[meex]

please forward to Yuchen

in order to avoid updating the browser extension as often, consider 
having it download and cache assets from the git repo

for example, LibreJS very often fails to find a contact mail address - a 
list could be submitted by users and kept on the repo for fetching by 
the ext.

when a mail address is known, consider running the mail client with a 
pre-filled address, subject and body

for the mail body, perhaps the contact should be given resources so they 
can fix/replace/remove offending JS

for the 'LibreJS Complaint' UI, consider closing it with Esc key press

consider expanding the ext., or creating another, which does as LibreJS 
does now (plus as suggested above) for sites that use 3rd party 
resources unnecessarily or privacy invasive resources