* The following variable shall be enabled: toolkit.legacyUserProfileCustomizations. * Prerequisites as of Thunderbird version 68: Simple example files /chrome/UserChrome.css:Īll content of the Thunderbird window enlarged to 16pts: /* File chrome/UserChrome.css for Thunderbird 68+ 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.Prerequisites as of Thunderbird version 68 (also Firefox v.69): One have to enable the following configuration variable: (see this announce)

You can still manually install 64-bit Firefox, if you choose.

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.

Mozilla Firefox fans have an easy to use solution for their email needs. Thunderbird is Mozilla’s award-winning email solution. Mozilla Thunderbird is a highly rated email software program that delivers on all of those. Check your Firefox version (in the “About Firefox” window) and look for “(32-bit)” or “(64-bit)” after the version number: Email clients require speed, reliability, and features to gain the market’s attention. 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. Users on 64-bit Windows who download Firefox can get our 64-bit version by default.

Thunderbird 64 bits windows 10