Pre-release versions of Firefox, such as Firefox Beta and Firefox Nightly, let you test upcoming features and updates in your environment before they are released to the public.
- Firefox Beta: one version ahead of regular Firefox. For example, if regular Firefox is 65, the Beta version will be 66).
- Firefox Nightly: Two versions ahead of regular Firefox. If the regular version is 65, the Nightly version is 67.
Visit the Firefox channels page to download test versions of Firefox.