Update to addon-sdk - Githubissues

The FUEL application used to read/write settings are deprecated since Firefox 40. The settings should new be accessed throw simple-prefs module.

Here is my list of reminders during the port:

[x] Find translation system of title and description of package.json (no way to to do it. See: https://bugzilla.mozilla.org/show_bug.cgi?id=1123428 A workaround until it's fixed: http://stackoverflow.com/questions/28857455/how-do-i-convert-a-package-json-to-install-rdf-for-a-firefox-add-on )
[x] Check type system of simple-prefs
[x] Check URL opened in a new tab are closed to the old one
[x] Check if panel closes well when url is loaded, changed, etc...
[x] Restore localized tooltip on urlbar button
[x] Find a way to load CSS for toolbar button
[x] Check focus request on starting input
[x] Find a way to prevent awesomebar to pop up when using url panel
[x] Support extension unload (remove dom elements, listeners, stylesheets)
[x] Fix panel showing with about: pages
[x] Check which API to use for unload: exports.unload() or when() from system/unload module

Tasks related to the port:

PerfectSlayer / scrollupfolder