Firefox 123 launches sporting broken site reporting capabilities
Firefox 122 arrived on January 23, being followed by 122.0.1 on February 6. Today, Mozilla is dropping Firefox 123 across all desktop platforms. Android users, however, remain stuck with version 122.1.0 for now, which was released on February 14. Since the Release Notes page for 123.0 also contains a few references to the Android version of the browser, Firefox 123 for Android will probably drop today or tomorrow as well.
The most important changes are the integration of search into Firefox View, which allows users to search through all tabs on each section subpage, namely Recent Browsing, Open Tabs, Recently Closed Tabs, Tabs from other devices, and History. The Web Compatibility Reporting Tool does exactly what the name says and, in the long run, it might help Mozilla decrease drastically the number of errors encountered when loading certain websites.
In addition to the above, Firefox 123 also comes with a wide range of minor security fixes, visual results for searches entered in the address bar (only for Google Search), off-main-thread canvas on macOS, Linux, and Android, a new location for the address bar settings (Firefox Settings>Search), and more.
Firefox 123 requires Windows 10 or later, at least macOS 10.15, and also works with all GNU/Linux distros that come with the following (or later versions): GTK+ 3.14, glibc 2.17, libglib 2.42, libstdc++ 4.8.1, and X.Org 1.0 (1.7 recommended). To ensure optimal functionality, the following trio is also recommended: DBus 1.0, NetworkManager 0.7, and PulseAudio.
Developers interested in this browser might find Daniel Melehi's book How to Make a Firefox Extension : (And Sell It!) (Cross-Platform Extension Chronicles) a useful ally. It is currently available only in the Kindle Edition format and can be acquired for $9.99.
Source(s)
Mozilla (Firefox 123.0 release notes)