758740 - Stylesheets included via chrome.manifest disappear

Status: UNCONFIRMED

(Toolkit :: General, defect)

Description

[rsjtdrjgfuzkfg (Dirk Steinmetz)]

Attachment: Test Extension to reproduce the bug in Thunderbird or Firefox

When (re)installing or activating an add-on with a stylesheet loaded into an overlay via chrome.manifest, or when disabling, (un)installing, or enabling another add-on while such an add-on is installed, the add-on using the chrome registration stylesheet works for two restarts - after that the registration seems gone.

This issue can also be "solved" for two restarts with restartless add-ons (after restarting once, of course).

STR:
Clean Profile, tested at TB 12.0.1.
I do not explicitly list it, but on each restart close all windows for account creation and making TB the default application, if any.

1. Install attatched reproduction add-on, including doing the restart.
-> you should now see the effect of the injected css: red font in menu and toolbar (and some other places as well) and black backgrounds.
2. Close Thunderbird
3. Open Thunderbird
4. Close Thunderbird yet again
5. Open Thunderbird a last time

EXPECTED:
No change with the restarts, red font on black background

ACTUAL:
Even though the attatched add-on is still active, one of its stylesheet is not loaded anymore (black backgrounds persist, red font doesn't work anymore). This state consists over further restarts.

NOTES:
If not following the STR's initial condition of a clean profile (including another theme and some add-ons) the issue is gone with my main profile. Note that I recived a bug report for my add-on LightningButton because of this issue, so it seems that there are some cases this occurs on real-world profiles. I have no idea what change "solved" the issue in my main profile.

I tested extracting the files and linking with a path in a text file named "[e-mail]" in the profile's extension folder, regular install from file using the button next to the add-on search field and installation via dragging the file to the extensions page within the add-on tab.

Comment 1

[Menar1d]

It has an id attribute so it can be referred to later if necessary, either in a script or for styling with CSS https://www.mcdvoice.onl/