You can check the network.http.* prefs on the about:config page and reset all bold user set network.http prefs to the default value via the right-click context menu -> Reset.

Check at least:

• network.http.accept-encoding (default: gzip,deflate)
• http://kb.mozillazine.org/network.http.accept-encoding

Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• Press and hold Shift 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 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"

hello kfnpemai, enter about:config into the firefox location bar & search for the preference named network.http.accept-encoding - right-click and reset that entry to the default value. if this does not resolve the issue already, please also go through the steps offered at Websites look wrong or appear differently than they should.

please explain what Firefox location bar is

"Location bar" is the url bar (where you type a site's address in firefox). Hope this helps. :)

See:

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