> For the complete documentation index, see [llms.txt](https://developer.thunderbird.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.thunderbird.net/releases/feature-flags.md).

# Feature Flags

Feature Flags are used to manage features that are not yet ready for general use. Their behavior varies depending on the branch:

## **main**

Feature flags are enabled once all related code for the feature have landed.

## **beta**

Feature flags remain enabled once the feature is complete unless the developers decide to temporarily pause it.

## **release and esr**

Feature flags are disabled by default until an explicit decision is made to enable the feature for all users.