Fixed an issue on macOS where smart cards and security keys

Version 151.0.2, first offered to Release channel users on May 26, 2026

Fixed

• Fixed an issue on macOS where smart cards and security keys could fail to load certificates automatically. (Bug 2041208)
• Fixed an issue where adding another tab to an existing Split View could unexpectedly close it. (Bug 2039795)
• Fixed an issue where Split View would close instead of switching tabs when using the "Switch to Tab" option from the address bar. (Bug 2039787)
• Fixed a crash on Windows that occurred when using the Sogou input method to type Simplified Chinese. (Bug 2039203)
• Fixed an issue where Firefox stopped caching new content once the disk cache was full, causing pages and resources to be re-downloaded from the network on every visit. (Bug 2031577)
• Fixed an issue where some websites could render incorrectly or fail to load when they used JavaScript to insert WebKit-specific style rules. (Bug 2040693)
• Fixed an issue where clicking and selecting text in some input fields and text areas did not work on pages that styled them with certain CSS rules. (Bug 2039504)
• Fixed an issue where the up and down buttons on number input fields could overlap and hide the value when sites sized the field to fit its contents. (Bug 2039315)
• Fixed an issue where sorting strings that include numbers could produce an incorrect order on some websites and web applications. (Bug 2027078)
• Fixed an issue where dropdown menus would not open for <select> elements created inside an iframe and then moved into the parent page. (Bug 2041720)