Hi,

Please try the Reset Firefox feature via Help (Alt + H) > Troubleshooting Information.

(To revert to the previous profile you were using, close the new profile (i.e. exit Firefox), start Firefox and choose the Default User profile. While the Profile Manager is open, you can also delete the newly reset profile (the one containing random numbers), or the former profile, as the case may be). If the reset is okay, it would be a good idea to delete the old profile as otherwise it would be left intact with the previous data/cache until deleted.

Managing profiles

Profiles Howto

Such issues are usually caused by ad-blocking or security software that removes GET data from links and that makes the server send a file that Firefox wants to save.

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"

See also:

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