Hallo Peavey212, leider können wir im Moment in diesem Support Forum nur Fragen auf Englisch beantworten. Falls du deine Frage auf deutsch stellen willst, verwende bitte das Forum der deutschsprachigen Community unter http://www.camp-firefox.de/forum/. Vielen Dank für dein Verständnis!

You can try to reset network.http prefs that appear user set (bold) on the about:config page.

• http://kb.mozillazine.org/about:config

Also make sure that your security software isn't causing these problems by modifying HTTP response headers.

You can try these steps in case of issues with web pages:

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• Hold down the Shift key and left-click the Reload button
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Command + Shift + R" (Mac)

Clear the cache and remove cookies only from websites that cause problems.

"Clear the Cache":

• Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

• Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
• Do NOT click the Reset button on the Safe Mode start window

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes