I’d like to update my add-on (Lightning QR-Code Add-on) to make it work with thunderbird-60.3.1 but even after searching for quite some time I haven’t really got a clue what changed and what should still work. Some add-ons should work, some should not. I tried the new version when it appeared a few weeks ago, but half of my add-ons haven’t been working at that time any more, even when forcing them to activate.
Where can I find information about these changes? Are there any guides for migration (especially for thunderbird!) for developers, e.g. about which parts of the API are still supported, what is deprecated, which parts of the Firefox WebExtension APIs are supported by thunderbird-60.3.1?