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If Firefox opens with a blank or transparent window with no user interface, a problematic add-on can be the cause. This article will help resolve the problem.

On a system with problematic or malicious add-ons installed, Firefox may open with a blank or transparent window and with no interface elements visible. In some instances Firefox may also crash. This article describes how to resolve the problem. [[Image:blank or transparent window]] {note}'''Note:''' This is an example how an affected version of Firefox might look like.{/note} __TOC__ =1. Start Firefox in Safe Mode= Make sure that no other instance of Firefox is running or no other Firefox window is open. You can then start Firefox in Safe Mode by {for win}holding down the {key shift} key while starting Firefox.{/for}{for mac}holding down the {key option} key while starting Firefox.{/for}{for linux}going to your '''Terminal''' and running: <code>firefox -safe-mode</code><br>You may need to specify the Firefox installation path (e.g. {filepath /usr/lib/firefox}){/for} :[[Image:Safe Mode Fx 15 - Win]] Now click on the {button Start in Safe Mode} button in order to run Firefox with extensions and themes disabled for this session. =2. Find and remove problematic extensions= # [[T:Open Add-ons|type=Extensions]] # Look out for suspicious extensions, in particular entries that you have not installed intentionally or don't know what purpose they serve. For example toolbars that come bundled with third-party software can cause this issue. Other examples of problematic add-ons are ''Browser Companion Helper'', ''Codec-C'', ''Codecv'', ''OneClickDownloader'', ''TheBflix'' & ''wxDfast'' (this list is not exhaustive). # Click the {button Remove} button next to such extensions or, in case it is not available, disable those entries.<br><br>[[Image:remove addons during safemode]] # Afterwards, restart Firefox. {note}'''Note:''' If you're unsure which extension to remove or disable, [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems#w_disable-all-extensions|disable all extensions]] listed in the Add-ons Manager and restart Firefox.{/note} {for win} =3. Check your computer for malware= After completing the above steps, check your computer for malware. See [[Troubleshoot Firefox issues caused by malware#w_how-do-i-get-rid-of-malware|How do I get rid of malware?]] for some recommended malware removal programs. {/for} [[Template:ShareArticle|link=http://mzl.la/SmQxgA]]