Firefox stops displaying wepages like Youtube.com properly after browsing for a while.
After browsing for a while, Firefox 17.0.1 stops displaying websites properly. An example is on youtube.com there is a whole bunch of text aligned to the right in blue and I can't even watch any videos. When I go into private browsing mode it goes back to normal, but as soon as I switch back to normal browsing it happens again. I've tried deleting all my browsing history and cookies but nothing works.
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First, update to Firefox 17.0.1, then reset Firefox. Refresh Firefox - reset add-ons and settings
Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
- Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
- Tools > Options > Privacy > Cookies: "Show Cookies"
If you use extensions (Tools > Add-ons > Extensions) like Adblock Plus or NoScript or Flash Block that can block content then make sure that such extensions aren't blocking content.
A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See: