la v.24 di FireFox ha ricevuto solo una serie di piccole ma importanti modifiche finalizzate ad una
maggiore stabilità e sicurezza.

Di nuovo c'è davvero pochissimo:
Support for new scrollbar style in Mac OS X 10.7 and newer
​Implemented Close tabs to the right
​Social: Ability to tear-off chat windows to view separately by simply dragging them out

questo è ciò che è stato modificato:
Accessibility related improvements on using pinned tabs (see 577727)
Removed support for Revocation Lists feature (see867465)
Performance improvements on New Tab Page loads (see 791670)

quello che segue è stato aggiunto per gli sviluppatori:
Major SVG rendering improvements around Image tiling and scaling (see 600207 )
Improved and unified Browser console for enhanced debugging experience, replacing existing Error console
Removed support for sherlock files that are loaded from application or profile directory

questi, infine, sono i fix per sopperire ai bug ereditati dalla v.23:
MFSA 2013-92 GC hazard with default compartments and frame chain restoration
MFSA 2013-91 User-defined properties on DOM proxies get the wrong "this" object
MFSA 2013-90 Memory corruption involving scrolling
MFSA 2013-89 Buffer overflow with multi-column, lists, and floats
MFSA 2013-88 compartment mismatch re-attaching XBL-backed nodes
MFSA 2013-87 Shared object library loading from writable location
MFSA 2013-86 WebGL Information disclosure through OS X NVIDIA graphic drivers
MFSA 2013-85 Uninitialized data in IonMonkey
MFSA 2013-84 Same-origin bypass through symbolic links
MFSA 2013-83 Mozilla Updater does not lock MAR file after signature verification
MFSA 2013-82 Calling scope for new Javascript objects can lead to memory corruption
MFSA 2013-81 Use-after-free with select element
MFSA 2013-80 NativeKey continues handling key messages after widget is destroyed
MFSA 2013-79 Use-after-free in Animation Manager during stylesheet cloning
MFSA 2013-78 Integer overflow in ANGLE library
MFSA 2013-77 Improper state in HTML5 Tree Builder with templates
MFSA 2013-76 Miscellaneous memory safety hazards (rv:24.0 / rv:17.0.9)

al momento esiste solo un bug noto:
If you try to start Firefox using a locked profile, it will crash (see 573369)