Download firefox version 55.03

Modernized application update UI to be less intrusive and more aligned with the rest of the browser. Only users who have not restarted their browser 8 days after downloading an update or users who opted out of automatic updates will see this change. Firefox does not support downgrades, even though this may have worked in past versions. This change will not be visible to all users immediately. For more information see the Firefox plugin roadmap. Download Firefox Firefox Privacy Notice.

Get Mozilla VPN. An error message about XPCOM missing or about platform version usually happens because of a failed Firefox update that left you with a mixture of old and updated files in the Firefox program folder. This can happen in case security software was keeping a handle of some of the files in the Firefox program folder preventing Firefox from replacing all the files.

You can do a clean reinstall to ensure that all files are replaced. You may have to disable security software temporarily in case the problem persists.

On Mac: Hold the option key while starting Firefox. On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode you may need to specify the Firefox installation path e. Please follow the steps in the [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]] article to find the cause. A new feature checks your add-ons to see which ones you installed and which ones come from third-party vendors, such as security suite makers.

The browser will now ask you if you'd like to disable any of these third-party add-ons. Interface The menu bar has been squished into an orange button on the upper left, with menu options spread across two columns. Performance Firefox is built on top of the powerful new Gecko platform, resulting in a safer, easier to use and more personal product. Mozilla plans to crowdsource its performance data to learn more about how the browser performs in real-world situations.

Features Firefox's features are robust and generally competitive. The most important feature in the modern Firefox is Sync. Upload Software Get points for uploading software and use them to redeem prizes! Follow OldVersion. Old Version. Add info. Mozilla Firefox 1. Mozilla Firefox 3.