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safemode addon extension theme diagnose

To restart in Firefox Safe Mode to troubleshoot and fix problems, select "Restart with Add-ons Disabled" in Firefox's Help menu. Learn more.

'''Safe Mode''' is a special Firefox mode that can be used to troubleshoot and fix problems. When you start Firefox in Safe Mode, it temporarily turns off hardware acceleration, uses the default theme, disables extensions that might be causing problems and ignores some customizations ([[#w_more-information-advanced-users|see below]] to learn more). Comparing Firefox's behavior in normal mode to its behavior in Safe Mode may help pinpoint the cause of the problem. {for win} {note}Windows users may be familiar with Safe Mode for Windows. Firefox Safe Mode has '''no connection to Windows Safe Mode.'''{/note} {/for} {note}[[Template:reset-fx]]{/note} __TOC__ = How to start Firefox in Safe Mode = [[T:safemode]] = Safe Mode window = :[[Image:SafeMode-Fx35]] You now have two options: * Clicking the {button Start in Safe Mode} button will temporarily disable your extensions and themes, turn off hardware acceleration and reset toolbar and button customizations. When you leave Safe Mode and start Firefox up normally, your extensions, themes, and settings will return to the state they were in before you entered Safe Mode. * Clicking the {button Refresh Firefox} button will restore Firefox to its factory default state while saving your essential information. See [[Refresh Firefox - reset add-ons and settings]] for more information about this option. =Troubleshooting problems in Safe Mode= Once Firefox is in Safe Mode, you'll want to test its behavior and see if the problem goes away. == The problem happens in Safe Mode == If the problem still happens in Safe Mode, it is not being caused by an extension or theme. Other possible causes include the Adobe Flash plugin or changes made to Firefox preference settings, which are not disabled in Safe Mode. See the following articles for solutions: *[[Troubleshoot and diagnose Firefox problems]] *[[Flash Plugin - Keep it up to date and troubleshoot problems]] *[[Reset Firefox preferences to troubleshoot and fix problems]] == The problem does not happen in Safe Mode == If the problem does not happen in Safe Mode, it is most likely because of an extension, theme or hardware acceleration. * See the article [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]] for solutions. = Exiting Safe Mode = # [[T:closeFirefox]] # Start Firefox as you normally would. #* If Firefox keeps starting in Safe Mode, see [[Firefox is stuck in Safe Mode]]. = More information (Advanced users) = In addition to disabling add-ons (extensions and themes) and turning off hardware acceleration, Firefox Safe Mode also disables the [https://hacks.mozilla.org/2017/02/a-crash-course-in-just-in-time-jit-compilers/ JavaScript Just-in-time (JIT) compiler] and ignores the optional userContent.css and userChrome.css files (if present). The xulstore.json file, which saves [[Changes to toolbars and window sizes are not saved|customizations to window sizes, toolbar settings and controls]], is also ignored; however, any changes stored in [[Configuration Editor for Firefox|modified preferences]] remain in effect. <!-- MZ credit --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Safe_Mode Safe mode (mozillaZine KB)]'''''