Các câu trả lời gần đây cho How do i stop that a picture of the previous tab stays in front of my new tab?https://support.mozilla.org/vi/questions/10619792015-05-14T07:12:18-07:00This can sometimes be caused by having hardware acceleration enabled. Go to the firefox preferences 2015-05-14T07:12:18-07:00user293https://support.mozilla.org/vi/questions/1061979#answer-728220<p>This can sometimes be caused by having hardware acceleration enabled. Go to the firefox preferences (enter about:preferences in the address bar), go to the "advanced" section &gt; general, and uncheck the "Use hardware acceleration when available" option.
</p>Try Firefox Safe Mode to see if the problem goes away. Firefox Safe Mode is a troubleshooting mode 2015-05-14T00:48:38-07:00the-edmeisterhttps://support.mozilla.org/vi/questions/1061979#answer-728080<p><strong>Try Firefox Safe Mode</strong> to see if the problem goes away. <a href="/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode" rel="nofollow">Firefox Safe Mode</a> is a troubleshooting mode that temporarily turns off hardware acceleration, resets some settings, and disables add-ons (extensions and themes).
</p><p><strong>If Firefox is open,</strong> you can restart in Firefox Safe Mode from the Help menu:
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<ul><li> Click the menu button <img class="wiki-image frameless" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/gallery/images/2014-01-10-13-08-08-f52b8c.png" alt="New Fx Menu" title="">, click Help <img class="wiki-image frameless" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/gallery/images/2014-01-10-13-10-08-eaa722.png" alt="Help-29" title=""> and select <em>Restart with Add-ons Disabled</em>.
</li></ul>
<p><strong>If Firefox is not running,</strong> you can start Firefox in Safe Mode as follows:
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<ul><li> On Windows: Hold the <strong>Shift</strong> key when you open the Firefox desktop or Start menu shortcut.
</li><li> On Mac: Hold the <strong>option</strong> key while starting Firefox.
</li><li> On Linux: Quit Firefox, go to your Terminal and run <em>firefox -safe-mode</em> <br>(you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
</li></ul>
<p>When the Firefox Safe Mode window appears, select "Start in Safe Mode".
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<dl><dt><img class="wiki-image frameless" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/gallery/images/2014-12-18-07-22-44-971830.png" alt="SafeMode-Fx35" title="">
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<p><em><strong>If the issue is not present in Firefox Safe Mode</strong></em>, your problem is probably caused by an extension, theme, or hardware acceleration. Please follow the steps in the <a href="/en-US/kb/troubleshoot-extensions-themes-to-fix-problems" rel="nofollow">Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems</a> article to find the cause.
</p><p><em>To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.</em>
</p><p>When you figure out what's causing your issues, please let us know. It might help others with the same problem.
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