Deal with mandatory extension signing post FF45esr
Basically, Firefox >45 will refuse to load extensions that are not
signed. For Firefox 45 (which Tor Browser 6.0.x is based on) it can be
disabled via the
xpinstall.signatures.required pref, but the add-ons
page will show semi-scary warning for such extensions.
This is a problem primarily for our amnesia branding extension, which we
generate at build. Most likely we cannot use that approach any more, but
instead we’ll have to resort to modifying the Tor Browser installation
directory (probably some
omni.ja file or similar).
Feature Branch: feature/12464-tor-browser-7.0