Turns off its self on Firefox 140.6.0esr

[YaTaUser]

Prerequisites

• I verified that this is not a filter list issue. Report any issues with filter lists or broken website functionality in the uAssets issue tracker.
• This is NOT a YouTube, Facebook or Twitch report. These sites MUST be reported by clicking their respective links.
• This is not a support issue or a question. For support, questions, or help, visit /r/uBlockOrigin.
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue.
• The issue is not present after disabling uBO in the browser.
• I checked the documentation to understand that the issue I am reporting is not normal behavior.

I tried to reproduce the issue when...

• uBO is the only extension.
• uBO uses default lists and settings.
• using a new, unmodified browser profile.

Description

µBlock Origin starts turned off and turns off a second after attempts to turn it on. No surprise, no blocking happens.

I made a screencast demonstrating this on an empty tab, with some explaining texts added:

Block.Origin.Demo.mp4

µBlock Origin used to work fine up to a couple of days ago. There's a small chance this started with the update from Firefox 128.13 to 140.6.

That said, I just see that here on the issue editing page, the µBlock Origin icon is not greyed out. Clicking on it gives an empty rectangle, though:

A specific URL where the issue occurs.

Same behavior on all websites, even on an empty tab.

Steps to Reproduce

1. Open a browser tab.

Expected behavior

µBlock Origin starts turned on and stays turned on after attempts to turn it on.

Actual behavior

µBlock Origin turns its self off.

uBO version

1.68.0

Browser name and version

Firefox 140.6.0esr

Operating System and version

Debian 13 'trixie'

[gorhill]

What the content of your "Trusted sites" pane?

[YaTaUser]

When reporting the issue it was this:

chrome-extension-scheme
moz-extension-scheme
chrome-scheme
edge-scheme
newtab.about-scheme
opera-scheme
vivaldi-scheme
wyciwyg-scheme

I have no idea how these entries got there, for sure I didn't put them there.

Indeed, removing all of them returns µBlock Origin to what it was: well and flawlessly working.

I guess that's the solution already. Now I only have to decide whether I should feel ashamed of reporting an issue which isn't really a bug. Later, perhaps.

Anyways, thank you very much for this quick response. If I can help finding a mitigation to avoid this issue happening to others, please let me know.

[gorhill]

Don't remove moz-extension-scheme, this could cause issues -- it's in there by default, and so are most of the others. The only one I thought could be an issue is newtab.about-scheme, but adding this one on my side causes no issue, so I am unable to reproduce your issue. The fact that the popup panel ended up empty suggest to me another extension could have been causing these issues. What are your other installed extensions?