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Firefox

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Click the menu button , choose History and select Clear Recent History.... In the Time Range to clear: drop-down, select Everything. Click the arrow next to Details to display the list of items that can be cleared. Select both Cookies and Cache. Click Clear Now.
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Go to Adobe's Flash Player download page and download the Flash installer. Caution: Adobe's download page may include a checkbox for optional software (such as Google Chrome or McAfee Security Scan) that is selected by default. If you do not clear the checkbox before
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In the address bar, type about:config and press EnterReturn. The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise!I accept the risk! to continue to the about:config page.
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Open your profile folder: Click the menu button , click help and select Troubleshooting Information. The Troubleshooting Information tab will open. Under the Application Basics section, click on Show FolderOpen FolderShow in FinderOpen Directory.
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Close the about:preferences page. Any changes you've made will automatically be saved.
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Click Set Up Firefox Sync. Click I Have A Firefox Sync Account. Enter your Sync email address and password and then click NextContinue. Enter your Sync Key and then click NextContinue. Your Sync Key is a long series of characters that was created
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Support will end for all NPAPI plugins except for Flash in March 2017, when Firefox version 52 is released. See this compatibility document and this article for details. Beginning with Firefox version 52, support has ended for all NPAPI plugins except for Adobe Flash. See this
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Click the menu button , click help and select Troubleshooting Information. The Troubleshooting Information tab will open. Under the Application Basics section, click on Show FolderOpen FolderShow in FinderOpen Directory. A window with your profile
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The Refresh Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Consider using it before going through a lengthy troubleshooting process.
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Click the menu button and then click ExitQuit .
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Note: This applies to the latest Firefox {{{channel}}} version which can be downloaded from mozilla.org/{{{slug}}}.
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Click the menu button and choose Add-ons. The Add-ons Manager tab will open. In the Add-ons Manager tab, select the {{{type}}} panel.
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Note: Please update your version of Firefox to enjoy these latest features.
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While this screenshot is for Linux, it will look similar on Windows. While this screenshot is for Linux, it will look similar on Mac OS X.
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To check if any of your installed plugins are out of date, visit Mozilla's Plugin Check & Updates page.
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Occasionally you may come across a page that simply doesn't work in Firefox. If that happens, please report the problem to Mozilla as follows: Click the menu button , click help and select Submit Feedback.... The Submit Your Feedback page will
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Click the menu button and then click help . From the Help menu choose Troubleshooting Information. If you're unable to access the Help menu, type about:support in your address bar to bring up the Troubleshooting Information page. Click the Refresh
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Click the Bookmarks button and select Show All Bookmarks to open the Library window. From the toolbar on the Library window, click Import and Backup and choose Export Bookmarks to HTML.... In the Export Bookmarks File window that
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Select the Privacy panel. Set Firefox will: to Use custom settings for history.
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Click the menu button and choose Options.Preferences. Click the Sync tab on the left to open the Sync panel. In the Sync panel, click the Manage Account link to open the Firefox Accounts page. On the Firefox Accounts page, click the Change button next to Password. Enter
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