Mozilla 52 Esr ✔

| Feature | Support in 52 ESR | |--------|-------------------| | WebAssembly | (added in FF 52 desktop behind flag, but ESR had it disabled by default – unclear for enterprise) | | CSS Grid Layout | Yes (unprefixed) | | IntersectionObserver | No | | fetch() with credentials | Partial (limitations) | | WebRTC | Yes (older STUN/TURN) | | Service Workers | Partial (disabled by default in ESR for stability) | | Web Crypto API | Basic support | | WebGL 2 | No (added in FF 51/52 but not fully stable for ESR) |

Firefox 52 ESR received several security patches and updates during its support cycle, addressing various vulnerabilities and issues. Some notable security updates include: mozilla 52 esr

Some of the key features of Mozilla 52 ESR include: | Feature | Support in 52 ESR |