This update for MozillaFirefox fixes the following issues:
- Firefox was updated to 78.9.0 ESR (MFSA 2021-11, bsc#1183942)
- CVE-2021-23981: Texture upload into an unbound backing buffer resulted in an out-of-bound read
- CVE-2021-23982: Internal network hosts could have been probed by a malicious webpage
- CVE-2021-23984: Malicious extensions could have spoofed popup information
- CVE-2021-23987: Memory safety bugs