Mozilla Firefox Help

  This article summarizes the Firefox   Options   panels and what types of settings they contain. Click the menu button   and select  Options . The following panels are available: General panel This panel contains  options  for the following types of settings: General Startup  and  Tabs : This is where you can set Firefox as your default browser, set Firefox to restore your previous session at startup and choose how tabs are opened. Language and Appearance Fonts & Colors  and  Language : This is where you can change the fonts and colors websites use, where to choose the language to display menus, notifications, messages and other parts of the Firefox interface, where to choose a preferred display language for web pages and where you can choose to use the Firefox spell checker.  Mozilla Firefox Help Files and Applications Downloads ,  Applications  and  Digital...

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...

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...

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...

  Mozilla on Tuesday updated Firefox to version 87, adding a new privacy feature designed to automatically fix websites impaired by the browser's aggressive anti-tracking defenses.  Mozilla Firefox Help The organization's security engineers also patched eight vulnerabilities, only two of which were labeled as "High," Firefox's second-most-serious label. It was the second version of Firefox without a top-ranked "Critical" bug.  Firefox 87 can be downloaded for Windows, macOS and Linux from Mozilla's site. Because Firefox updates in the background, most users can relaunch the browser to install the latest version. To manually update on Windows, pull up the menu under the three horizontal bars at the upper right, then click the help icon (the question mark within a circle). Choose "About Firefox." (On macOS, "About Firefox" can be found under the "Firefox" menu.) The resulting page or pop-up shows that the browser is alread...