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).

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.

Check your Firefox version (in the “About Firefox” window) and look for “(32-bit)” or “(64-bit)” after the version number:

If you’re running 64-bit Windows ( here’s how to check), your Firefox may already be 64-bit. Linux and macOS users, fret not, you already enjoy a Firefox that’s optimized for 64-bit. 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. Here’s the key thing to know: 64-bit applications can access more memory and are less likely to crash than 32-bit applications. What’s the difference between 32-bit and 64-bit? How much less? In our tests so far, 64-bit Firefox reduced crashes by 39% on machines with 4GB of RAM or more. That means you get a more secure version of Firefox, one that also crashes a whole lot less. Do not follow the onscreen instructions to turn OS verification on, or you risk wiping your machine’s data and turning Developer Mode off.Users on 64-bit Windows who download Firefox can get our 64-bit version by default. Your device will now transition to Developer Mode.Įvery boot thereafter will also begin with that warning screen, and a need to press Ctrl-D to continue.

You will need to press Ctrl-D to continue. When you boot up your Chromebook, it will begin with a warning screen noting that “OS verification is OFF”.

You will be prompted with an opportunity to “turn OS verification OFF”. On most Chromebooks, you do so by turning the device off, then holding down the ESC and Refresh keys while you press the Power button. To get to Developer Mode, we need to first reboot into Recovery Mode. The use of Developer Mode may void your Chromebook’s warranty. This could include important data like any files you’ve downloaded, or locally cached passwords. Since ChromeOS is an online-centric operating system, the vast majority of your data will be stored remotely, but make sure you’ve backed up everything important that’s local to your machine before you begin. Placing your device into Developer Mode will wipe all data and user information from it.

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