Troubleshooting extensions and themes * https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes Clear Cookies & Cache * https://support.mozilla.com/en-US/kb/Template:clearCookiesCache Clear the Network Cache * https://support.mozilla.com/en-US/kb/How%20to%20clear%20the%20cache#w_clear-the-cache -> click '''Firefox''' button and click '''Options''' -> Privacy -> History section -> '''Firefox will: select "Use Custom Settings for History"''' -> REMOVE Checkmark from '''Permanent Private Browsing mode''' -> place Checkmarks on: 1) Remember my Browsing History 2) Remember Download History 3) Remember Search and Form History 4) Accept Cookies from sites -> click '''Exceptions...''' button -> type the addresses of the websites from which you want to Allow Cookies to be stored e.g. '''msn.com''' , '''yahoo.com''' , '''google.com''' , etc. -> click '''Allow''' for each, One by One 4a) Accept Third-party Cookies -> '''Keep Until : select''' '''They Expire''' -> REMOVE CHECKMARK from CLEAR HISTORY WHEN FIREFOX CLOSES -> click '''Firefox''' button and click '''Options''' -> Security -> place Checkmarks on: 1) Warn me when sites try to install add-ons 2) Block reported attack sites 3) Block reported web forgeries -> click '''Firefox''' button and click '''Options''' -> Advanced -> General -> Remove Checkmark from '''Warn me when websites try to redirect or reload the page''' -> Click OK on Options window -> Restart Firefox Check and tell if its working. -> When you use '''Clear Recent History''' make sure NOT to select '''Cookies, Forms and Search History, Active Logins, Site Preferences''' * https://support.mozilla.com/en-US/kb/Clear%20Recent%20History#w_what-things-are-included-in-my-history -> If you use Privacy Cleanup softwares like CCleaner, DON'T SELECT FIREFOX IN ITS SETTINGS. These softwares can be responsible for Deleting your Firefox Settings.