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Yesterday I installed the latest download of Firefox for Mac. It appears that I cannot visit any website, because I always get the message that the certificate is issued by an unknown authority. I spent most of the day finding a solution and am fed up now with Ff. I found many help pages, suggesting to remove cert8.db when Ff is closed, to reset Ff and several other solutions. I tried them all but nothing worked. No Web page has a valid certificate according to Ff. I am well acquainted with Ff. I have used it for years on Windows, Linux and Android and never had problems of this kind. I'm am using Osx 10.10.3 (rolled out yesterday, April 9 2015 with the latest available Ff for Mac. (27.0.1)After spending a whole day at pointless troubleshooting only one question remains: Is Ff for Mac not compatible with the brand new Osx 10.10.3?Thanks.Rene Hasekamp.

Users on 64-bit Windows who download Firefox can get our 64-bit version by default. That means you get a more secure version of Firefox, one that also crashes a whole lot less. How much less? In our tests so far, 64-bit Firefox reduced crashes by 39% on machines with 4GB of RAM or more.

Explore Our Help Articles. Dig into the knowledge base, tips and tricks, troubleshooting, and so much more. Firefox Browser; Firefox Private Network. If you see “(32-bit)” and you are running Firefox 56.0 or older, updating to the latest Firefox version should automatically upgrade you to 64-bit. If you see “(32-bit)” and are running Firefox 56.0.1 or newer, then your computer may not meet the minimum memory requirement for 64-bit (3 GB RAM or more). LastPass for Firefox (i386 and x64) LastPass browser extension for Mozilla Firefox. This will also work on other Mozilla based browsers such as SeaMonkey, Mozilla, etc. /download-mac-os-sierra-2019.html. If you experience issues, try starting Firefox in safe mode. Firefox Lockwise. Take the passwords you’ve saved in Firefox with you everywhere. Download for iOS; Download for Android; Support; Firefox Monitor. See if your personal info has been leaked online, and sign up for future breach alerts. Mozilla Firefox for Mac, free and safe download. Mozilla Firefox latest version: The best web browser out there. If you need to run 32-bit Firefox or manually install 64-bit Firefox, you can simply download and re-run the Windows (32-bit or 64-bit) Firefox installer from the Firefox platforms and languages download page. Take control of your browser. Download Firefox — English (US). Download Mozilla Firefox, a free Web browser. Firefox is created by a global non-profit dedicated to putting individuals in control online. Get Firefox for Windows, macOS, Linux, Android and iOS today!

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What’s the difference between 32-bit and 64-bit?

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Here’s the key thing to know: 64-bit applications can access more memory and are less likely to crash than 32-bit applications. Also, with the jump from 32 to 64 bits, a security feature called Address Space Layout Randomization (ASLR) works better to protect you from attackers. Linux and macOS users, fret not, you already enjoy a Firefox that’s optimized for 64-bit.

How do you get 64-bit Firefox?

If you’re running 64-bit Windows (here’s how to check), your Firefox may already be 64-bit. Check your Firefox version (in the “About Firefox” window) and look for “(32-bit)” or “(64-bit)” after the version number:

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If you see “(32-bit)” and you are running Firefox 56.0 or older, updating to the latest Firefox version should automatically upgrade you to 64-bit.
If you see “(32-bit)” and are running Firefox 56.0.1 or newer, then your computer may not meet the minimum memory requirement for 64-bit (3 GB RAM or more). You can still manually install 64-bit Firefox, if you choose.

If you need to run 32-bit Firefox or manually install 64-bit Firefox, you can simply download and re-run the Windows (32-bit or 64-bit) Firefox installer from the Firefox platforms and languages download page.