Mozilla Firefox Help

Firefox includes a page with information such as which Firefox version you are using, any installed extensions, important modified preferences, and graphics information. If you are  getting help on the support forum , content that you provide from this  Troubleshooting Information  page can help solve your Firefox issue.  Mozilla Firefox Help Accessing the Troubleshooting Information page Click the menu button  , click   Help  and select  Troubleshooting Information You will be taken to a page with the address  about:support . Give Firefox a tune up The Refresh Firefox feature can fix many issues by restoring Firefox to its default state while saving your essential information. Consider using it before going through a lengthy troubleshooting process. Try Safe Mode You can restart Firefox in Safe Mode to temporarily disable add-ons (extensions and themes), turn off hardware acceleration, and reset some settings that might be cau...

Some users have experienced issues with the  Lockwise Password Manager  not saving usernames and passwords when updating from an older Firefox version. This is due to a migration from using  key3.db  (in older versions) to  key4.db  (in current versions) when the decryption key is not migrated properly. This article describes how to safely migrate your login data for the latest version of Firefox.  Fix Firefox Error Find and back up old profile data First, make sure that you still have the  key3.db  file in your affected profile and save a backup copy, as follows: Click the menu button  , click  Help  and select  Troubleshooting Information .  The  Troubleshooting Information  tab will open. Under the  Application Basics  section next to Profile  Folder , click  Open Folder .  Your profile folder will open. Find the  key3.db  file and save a backup copy to an easy...

This article describes what to do if Firefox doesn't open when you click the Firefox icon. If you get a message you can dismiss (e.g.  "TypeError: Components.classes['@ ... ;1'] is undefined" ,  "onload error TypeError: ..." ,  "Exc in ev handl: ..." ) and can open Firefox, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems. If Firefox starts but won't load any websites, see Websites don't load - troubleshoot and fix error messages. The   Refresh Firefox feature   can fix many issues by restoring Firefox to its default state while saving your essential information. Consider using it before going through a lengthy troubleshooting process. The   Firefox Safe Mode   window includes a Refresh Firefox option. You can start Firefox in Safe Mode by   holding down the  shift  key while starting Firefox.    Mozilla Firefox Help Specific error messages Mozilla Crash Report...

Malware  is short for "Malicious Software". It is a term generally used for software installed on your computer that is designed to infiltrate or damage a computer system without the owner's informed consent. Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of. This article describes what common symptoms are and how to prevent malware from being installed and get rid of them.  Fix Firefox Error How do I know that my Firefox problem is a result of malware? Symptoms are various and depend on the malware but if you have one or several of these behaviors, you may have malware installed on your computer. Some ad popups display all the time , although you've blocked popups. For more information on blocking popups, see Pop-up blocker settings, exceptions and troubleshooting. Your searches are redirected to another site  in order to feed you content from that website and you are being disallowed from blocking t...

Firefox users would do well to upgrade to the browser’s latest release if they want to keep their computers safe from compromise.  Mozilla Firefox Help Released on Monday, Firefox 58.0.1 contains one but very important security fix that plugs a vulnerability arising from insufficient sanitization of HTML fragments in chrome-privileged documents. (In this context, chrome is not the popular Google browser, but a component of Firefox.) The vulnerability (CVE-2018-5124) is considered critical because a successful exploit could allow the attacker to execute arbitrary code with the privileges of the user. And if the user has elevated privileges, the attacker could compromise the system completely. Another reason for such a classification is that exploitation can be triggered with just a bit of clever social engineering. “An attacker could exploit the vulnerability by persuading a user to access a link or file that submits malicious input to the affected software,” Cisco explain...

  Firefox blocks Secure Sockets Layer version 3.0 (SSLv3) to protect your information from attacks. SSLv3 is a type of technology that some websites use to connect to a server. It is no longer secure, which makes it easy for hackers to extract your personal information during a connection. For more information, see  Fix Firefox Error What happens when you access vulnerable sites When you try to access a site that only supports Secure Sockets Layer version 3.0 (SSLv3), Firefox blocks it and displays a message,   Unable to Connect Securely , explaining that Firefox cannot guarantee the safety of your data on that website because it uses SSLv3, a broken security protocol. If you see this message, please contact the website owner to let them know about the problem. Additional precautions To further protect yourself from attacks, keep Firefox up to date. The simplest way to do this is to set up automatic updates: Click the menu button   and select  Options ...