Firefox Beta is the build for those who like a little bit of jeopardy, but who don’t want to risk everything by trying out Firefox Developer, the early alpha build of Firefox. Firefox Beta gives you a sneak peek at the next version of Firefox six weeks ahead of its final release, offering a relatively stable build that’s not quite ready for primetime, but still pretty solid.

Whereas Firefox Developer installs as a completely separate application alongside your existing Firefox installation, Firebox Beta will replace the stable build. Should you subsequently wish to go back to the safer version, you’ll need to manually download the stable version and install it over the top of the beta build.

Confirm which build you have by selecting About Firefox from the Firefox menu or button (it’s inside the Help menu if using the Firefox button).

Firefox 66 is now in the Beta channel. New features include:

- Increased content processes to 8
- Added capability to search through open tabs from the tab overflow menu
- New backend for the storage.local WebExtensions API, providing I/O performance improvements when the extension updates a small subset of the stored data
- WebExtension keyboard shortcuts can now be managed or overridden from about:addons
- Improved scrolling behavior: Firefox will now attempt to keep content from jumping around while a page is loading by supporting scroll anchoring
- New about:privatebrowsing with search
- Basic macOS touchbar support
- A certificate error page now notifies the user of the name of the certificate issuer that breaks HTTPs connections on intercepted connections to help troubleshooting possible anti-virus software issues.

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Check out the next version of Firefox before it's released.