Notable bug fixes
* Web page rendering and interaction
o 217527 - Left column on Slashdot is sometimes too narrow or too wide for its contents.
o 238493 - Ads on Gamespot flicker into other parts of the page during page load.
o 95227 - Make it possible to set different default font type (serif vs sans serif) for different languages.
o 47350 - Current scroll position not retained, reloading or going back to multipart/x-mixed-replace (e.g. Bugzilla bug lists).
o 56314 - Reverse selection colors when page background is similar to default selection background.
o 274553 - Blocking iframes either via an extension or userchrome.css breaks find toolbar search.
o 103638 - Targets with same name in different windows open in wrong window with javascript.
o 62384 - Text Zoom doesn't change dropdown height (without reload).
o 97283 - Mouse wheel scrolling does not work for elements such as div using overflow - auto or scroll.
o 251986 - Keyboard scrolling does not work for elements such as div using overflow - auto or scroll.
o 209020 - Meta HTTP-EQUIV="refresh" broken if midas was ever used in that browser window.
o 198155 - Midas html editing mode persists after leaving the page that enabled it.
o 21616 - Space after ::first-letter pseudo-element line is larger than between other lines (improvement in first-letter drop-caps appearance?).
o 273785 - Plugins not scanned/detected on startup (empty plug-ins dialog in downloads, open-with dialog for PDFs).
o 76197 - Scrollbars should look disabled when there's nowhere to scroll (not yet fixed on Mac).
o 151375 - Focus outline should be drawn outside of element.
o 133165 - Focus outline should include larger descendants of inline elements.
o 65917 - :active neither hierarchical nor picky about what can be activated.
o 20022 - :hover state not set until mouse move.
o 278531 - Generic request prioritization (loadgroup prioritization) (e.g. for each HTTP host, load images with lower priority than pages).
* Improved error pages. To enable error pages, go to about:config and set browser.xul.error_pages.enabled to true.
o 157004 - Error pages should be stored in history and show the original URL in the address bar.
o 237244 - "Try Again" on XUL error pages does not repost form data.
* Downloads
o 239006 - Download manager doesn't account for filesize when presenting combined percentages.
o 245829 - Download manager progress and title do not update correctly, wrong number of files and percentage after finishing or cancelling a download.
o 249677 - Cancel does not delete temporary file in helper app dialog, if default action is save.
* Accessibility
o 175893 - Make XUL <tab>'s focusable.
o 162081 - Wrong letter is underlined as accesskey / mnemonic when widget direction is RTL.
o Many keyboard accessibility fixes.
o Many screen-reader accessibility fixes.
* Speed and memory-use improvements
o 227361 - Don't reflow documents in background tabs until window resizing is complete.
o 131456 - Memory use does not go down after closing tabs.
o Many other speed and memory-use improvements.
* Windows-specific bugs
o 16940 - [Windows] IME is now disabled for password fields.
o 255123 - [Windows] Opening URL from another app focuses an existing window before opening a new window.
o 171349 - [Win98] Firefox icon is Win98's standard icon (taskbar & upper lefthand corner of app).
o 284716 - [Win2k/WinXP] Create DDBs in nsImageWin::Optimize. (Fixes several performance bugs with large images, such as slow scrolling on exactaudiocopy.de.)
o 231300 - [Windows] Clearing cache is slow (nsLocalFile::MoveTo is slow to move directories).
* Mac-specific bugs
o 222364 - [Mac] Don't use sheet for the about box.
o 273217 - [Mac] Lots of menu items are enabled that shouldn't be when no windows are open, and many menu items that are correctly enabled do not work.
o 187508 - [Mac] Follow "full keyboard access" setting in System Preferences for tabbing navigation.
o 151249 - [Mac] Middle click on link does nothing on Mac OS X (should open link in new tab).
o 220589 - Cmd-Enter and Cmd-Shift-Enter should work like win/lin builds.
o 239218 - Menus are nonfunctional when 'tools' have focus (Downloads / Extensions / Theme Managers, JavaScript Console and Page Info window).
* Linux-specific bugs
o 241245 - [Linux] Auto download to 'Desktop' downloads to home directory on Linux.
o 238854 - [GTK2] Changing GNOME2 theme doesn't apply until restarting Mozilla.
* 57724 - View Source corrects for parser errors and shows slightly different source than what was sent by the server.
* 269259 - When upgrading an extension, its metadata is not updated from the new install.rdf.
* 69114 - Opening Internet Shortcuts (.url files) doesn't work (using File | Open or file protocol)
* 245163 - Right-click context menu is cut off/disappearing/offscreen when it contains too many items (items added by extensions).
* 275430 - Change default for "open links from other applications" to be "a new tab in the most recent window" instead of "the most recent tab/window". (?)
* 253950 - Less confusing UI when default profile is locked on startup.