Rated 4 out of 5 stars

Daily user of this great add-on. However it stopped working altogether at some point; I'm not sure when. I'm currently running Thunderbird 128.2.0esr (64-bit) on Windows 23H2. I upgraded the extension to v1.2. I uninstalled/reinstalled it. I cleared checkboxes and restarted Thunderbird. Reenabling logging for each mail account doesn't seem to do anything. No logs are displayed.

-/Response to Dillinger's question/-
I've been using the add-on for a few years so I realize it is a shortcut but one which no longer functions. I can bring up my various filterlog.html files for each account in a browser, but I used to be able to view them within Thuderbird by pressing your button in TBird's menu bar which still does bring up the Message Filters dialog. But when I then click the button in the little Filter Log child dialog, logs are no longer displayed there.

Upon review of the bug documentation, I think that is the source of the problem: I have to resize the dialog box EVERY TIME I OPEN IT, for EACH ACCOUNT, now. And it's not easy to do because the resize handle doesn't perfectly align to the cursor. But it does appear to be Thunderbird's fault and not yours.

A VERY STUPID REGRESSION. And the Bugzilla report is closed? Marked closed/solved? Folded into another Bug#? I can't tell and as a user not a team nerd it's saddening.

Phish fighting is hard enough already without a major tool becoming unusable.

Thank you, Dillinger.

What stopped working?
This button only brings up the Message Filters dialog, it has no effect at all on whatever you do in there.
As for the logs, try resizing the Filter Log dialog, it could be this bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1691301