Certain WebGL operations on Apple silicon M series devices could have lead to an out-of-bounds write and memory corruption due to a flaw in Apple's GPU driver. *This bug only affected the application on Apple M series hardware. Other platforms were unaffected.* This vulnerability affects Firefox <133,FirefoxESR<128.5,FirefoxESR<115.18,Thunderbird<133,Thunderbird<128.5,andThunderbird<115.18.