[Firefox] uBlock disabled on first unloaded tab on the left

[gwarser]

Set Firefox to restore session from last time, and don't load tabs until selected.
Open few tabs. Select either tab on the right.
Restart browser.
Right click on tab bar on the first tab on the left, and select 'Reload Tab', wait until loaded. (may be automatically loaded when using Auto Unload Tab tabPreLoader extension)
Switch to this tab.
uBlock icon is grey, power button is grey, nothing is blocked.

It works when simply switching to first tab, but some resources may slip through.

Fx 41.0.1 on Linux Mint 17.2,
Fx 43a2 on Windows 7
uBlock 1.2.2b2

Example url:
https://encrypted.google.com/search?q=buy+iphone
https://www.inoreader.com/all_articles

Broken:

Reloaded:

[gorhill]

Ok, reproduced -- though uBlock is not disabled on my side but it did not detect properly which domain is 1st-party. When not reloading the tab first, uBlock detects properly the first-party domain of the page.

[gorhill]

Firefox's tab management is really complicated...

1. The tab is created when Firefox launches
2. It's URI is about:blank
3. It's pending attribute is NOT set (unexpected)
4. Eventually LocationChangeListener for the tab is called with https://www.inoreader.com/all_articles
5. However its pending attribute is now set...
6. Which means the event is ignored, and thus the tab is not rebound to the proper URI.

[gorhill]

Correction: the unexpected missing pending attribute happens only for the 1st tab, not the others... Ugh.

[gwarser]

Looks good, thank you.