| Chrome | Firefox | Action | |--------|---------|--------| | manifest_version : 3 (or 2) | Supports MV3, but some MV2 features deprecated | Prefer MV3 for future-proofing | | background.service_worker | background.scripts or background.page | Replace SW with background scripts (or use background.service_worker in MV3) | | action (MV3) | browser_action (MV2) / action (MV3) | Use MV3 naming if targeting both | | optional_host_permissions | optional_permissions with *://*/* | Adjust permission keys | | declarative_net_request | Partial support (rule limits differ) | Test rule sets; max 100k static rules vs Chrome’s 300k |
Use Firefox's built-in button to access a dedicated DevTools console for debugging background scripts and content scripts in one place. 5. Packaging and Distribution convert chrome extension to firefox
This feature allows developers to easily convert their Chrome extensions to Firefox extensions, making it possible to deploy their extensions across multiple browsers. | Chrome | Firefox | Action | |--------|---------|--------|
Historically, Chrome extensions relied on callbacks for asynchronous operations, whereas Firefox adopted Promises. whereas Firefox adopted Promises.