Firefox Beta and Developer Edition
Release Notes

We’ve made significant improvements in noise-suppression and auto-gain-control as well as slight improvements in echo-cancellation to provide you with a better overall experience.

We’ve also significantly reduced main-thread load.

When printing, you can now choose to print only the odd/even pages.

Fixes an issue where video intermittently drops SSRC

Fixes issue where WebRTC downgrades screen sharing resolution

Fixes video quality degradation in certain sites

Firefox for Linux changes shortcut key for "Select All" from Alt-a to Ctrl-a for solving web-compat and avoiding conflict with access keys. If you want to keep using Emacs like key bindings, e.g., you configured your GTK settings to use Ctrl-a as a shortcut key for moving caret to beginning of a line, you need to change ui.key.textcontrol.prefer_native_key_bindings_over_builtin_shortcut_key_definitions and ui.key.use_select_all_in_single_line_editor from about:config. These prefs are currently disabled by default but would be enabled by default in a future release.