Expired50% confidenceFactExact time
Mozilla Firefox, while implementing the MV3 API, has explicitly announced that it will continue to support MV2's webRequest blocking capability
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/20/2026
First Seen
This claim has expired. It is kept for the record and no longer describes the current state.
Valid until: 10/18/2026(expired)
Sources
Related Claims
UnverifiedFirefox retains the MV2 API while supporting MV3, allowing uBlock Origin to continue operating with full capabilities.77% similarUnverifiedFirefox adheres to the MV2 standard, enabling uBlock Origin to utilize the full capabilities of its filtering engine.71% similarUnverifiedModern browser extensions primarily follow the WebExtensions API standard, which was led by Mozilla, and has been adopted by mainstream browsers including Chrome, Firefox, and Edge.64% similarUnverifiedPlaywright's support for Firefox and WebKit is not achieved directly through CDP, but through dedicated debugging protocols implemented in cooperation with the respective browser teams.64% similarUnverifiedWebSurfer底层基于Playwright等浏览器自动化框架实现，Playwright由微软开发维护，支持Chromium、Firefox和WebKit三大浏览器引擎61% similar
Cite This Claim
Stable URI
https://kongchang.com/claim/569282API
curl https://kongchang.com/api/v1/knowledge/claims/569282MCP
get_claim(id=569282)