Loading error: Theme fails to fully load if "Message Filter" box is populated.

[n8marti]

Describe the bug
I sometimes use the Message Filter box to find messages in my Inbox. I've noticed that if there is text left in this filter box when Thunderbird starts the theme doesn't load properly.

To Reproduce (if applicable)
Steps to reproduce the behavior:

1. Enter text into "Message Filter" box.
2. Quit Thunderbird.
3. Restart Thunderbird
4. Side pane colors are not correct (and maybe other things I haven't noticed?).

Expected behavior
Normal theme colors should be used.

Screenshots

Build information:

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.3 LTS
Release:	20.04
Codename:	focal
$ thunderbird --version
 Thunderbird 78.14.0

[conema]

Hi @n8marti,
Sorry for the late answer. It seems that you are using an old version of TB and I cannot replicate this issue in the last version of TB and of the theme.
Which version of the theme are you using? I can give a look too see if a quick fix is possible

[n8marti]

I'm using the latest TB available from the Ubuntu repos, so I'd have to update it from a different source to get a newer version, which I'm a little reluctant to do because I rely heavily on TB for my day-to-day work and would hate to run into some other unexpected problem.

My extension version is 3.3, updated on Jan. 24th. But I'm fairly certain that I was having this problem before that update, if that's helpful. It's not a serious problem: I can just make sure to leave the filter box empty when I quit Thunderbird and everything works fine. I just sometime forget!