From time to time none of the JS-codes is working, and all sites (SE, AU, UL, GL&U, ...) are infected meanwhile, but with random exceptions.
I can't vote up, down, add a comment, don't get the toolbar for the edit box and so on.
I don't switch some settings in the browser, so JS isn't blocked, nothing. All that worked before and works normally.
I tried without success:
- reload the page
- Ctrl + reload the page
- disconnect and reconnect from the internet
- control JS-Settings
- check other settings
- disabled every greasemonkey - stuff (there isn't much)
- disabled ad block
- disabled popup blocker
- disabled referrer
- disabled proxy
- restarted Firefox (12.0 btw, but have experienced this before with former versions)
- deleted cache of today
I wanted to logout, but didn't find a logout option without js. I don't get a "you should enable JS" warning.
If I make a "View source code" I see all the JS.
I have experienced this before and get crazy on it! It happens too rarely to give a good estimation: I'm a heavy user on more than one site here with several visits per day and site. It's about since 3 months since it happened the last time. The problem stays for hours. This time it started in the night, and might be clock-related, since it happened around midnight UTC. Next time I will try to look for that earlier.
The last settings I changed, related to Firefox where not for Firefox itself, but language-settings for Thunderbird, which didn't update as expected some hours earlier.
I don't think it's related, because in the beginning after that, SE worked well.