Firefox 26 blocks plug-in content from loading by default (except Flash)

What’s New:

NEW: All Java plug-ins are defaulted to 'click to play'

NEW: Password manager now supports script-generated password fields

NEW: Updates can now be performed by Windows users without write permissions to Firefox install directory (requires Mozilla Maintenance Service)

NEW: Support for H.264 on Linux if the appropriate gstreamer plug-ins are installed

CHANGED: Support for MP3 decoding on Windows XP, completing MP3 support across Windows OS versions

CHANGED: CSP implementation now supports multiple policies, including the case of both an enforced and Report-Only policy, per the spec

DEVELOPER: Social API now supports Social Bookmarking for multiple providers through its SocialMarks functionality (see MDN docs)

DEVELOPER: Math.ToFloat32 takes a JS value and converts it to a Float32, whenever possible

DEVELOPER: There is no longer a prompt when websites use appcache

DEVELOPER: Support for the CSS image orientation property

DEVELOPER: New App Manager allows you to deploy and debug HTML5 webapps on Firefox OS phones and the Firefox OS Simulator

DEVELOPER: IndexedDB can now be used as a "optimistic" storage area so it doesn't require any prompts and data is stored in a pool with LRU eviction policy, in short temporary storage

FIXED: When displaying a standalone image, Firefox matches the EXIF orientation information contained within the JPEG image (298619)

FIXED: Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1 (812695)

FIXED: Improved page load times due to no longer decoding images that aren't visible (847223)

FIXED: AudioToolbox MP3 backend for OSX (914479)

FIXED: Various security fixes