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Safe Mode is a mode in Firefox used for troubleshooting problems. It can be used to reset settings, start without add-ons, and diagnose browser issues.

'''Safe Mode''' is a special Firefox execution mode that can be used to troubleshoot issues in Firefox. In Safe Mode, you can reset some settings or disable add-ons that might be the source of the issue. By comparing Firefox behavior in normal mode to its behavior in Safe Mode, where various items are disabled, you may be able to diagnose issues. {for win} {note}'''Note:''' Windows users may be familiar with a Safe Mode for Windows. Firefox Safe Mode has '''no connection to Windows Safe Mode.'''{/note} {/for} __TOC__ = How to start Firefox in Safe Mode = [[T:safemode]] = Safe Mode window = {for win,linux}[[Image:93cafd5e0e8bef77b66875863ae7f197-1259888532-113-1.png]]<br><br>{/for} You now have three options: * Clicking the {button Exit} button cancels your attempt to get into Firefox's Safe Mode. * Clicking the {button Continue In Safe Mode} button starts Firefox in its Safe Mode. While you are in Safe Mode, your extensions and themes will be disabled, <!-- see https://bugzilla.mozilla.org/show_bug.cgi?id=342333 (if fixed, plugins will also be disabled when continuing into Safe Mode). --> and any toolbar customizations will be reverted back to their defaults. These changes are temporary - 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. * The {button Make Changes and Restart} button is only enabled if you select one of the boxes above it. You can elect to make the following changes: {warning}'''Warning:''' When you make these changes and restart Firefox, they will remain in effect from that point on. Some of these changes cannot be undone.{/warning} <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=409959 --> * '''Disable all add-ons''': If you select this box and then click {button Make Changes and Restart} then Firefox will start back up in its normal mode, except all your extensions, themes and plugins will be disabled (not uninstalled). You can undo this change by enabling each extension and plugin listed in the Add-ons Manager. See [[Uninstalling add-ons|this article]] for general information about using the Add-ons Manager to disable and enable add-ons. * '''Reset toolbars and controls''': If you select this box and then click {button Make Changes and Restart} then Firefox will start back up in its normal mode, except any customizations you have made will be lost, such as window size or position, toolbar buttons, and other toolbar customizations. To undo this change, you will need to customize these settings again. See [[How do I customize the toolbars?]] for help with toolbar settings. * '''Delete all bookmarks except for backups''': If you select this box and then click {button Make Changes and Restart} then Firefox will '''delete''' your current bookmarks and replace them with the default set{for fx35} (this item is labeled '''Reset bookmarks to Firefox defaults''' in Firefox 3.5){/for}. Except for bookmarks added in the current session which will be lost, you can undo this change by restoring the last bookmark backup. See [[Backing up and restoring bookmarks]] for more help. * '''Reset all user preferences to Firefox defaults''': If you select this box and then click {button Make Changes and Restart} then changes you have made to Firefox options and preferences will be changed back to the default settings. This change will be hard to undo, since you may not remember all of the settings you have changed. * '''Restore default search engines''': If you select this box and then click {button Make Changes and Restart} then any of the default search engines you deleted will be restored. To undo this change, simply go to the [[Search Bar]] and remove the search engines you don't want. = 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]]. <!-- MZ credit --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Safe_Mode Safe mode (mozillaZine KB)]'''''