September 1st, 2005 
Released to the Greasemonkey mailing list, fixed bugs in the automatic migration system for the changes between the 0.3 and 0.5 branches.
- Security fix wherein a user script could elevate itself to chrome privileges.
- User can select the editor to use for "Edit" in manage, and "New User Script".
- Unicode support for non-english characters.
The first release containing security fixes over 0.3.5 intended for public consumption. "Greasemonkey 0.5 is actually the combination of a massive security audit and all the new code which was planned for 0.4."
- GM_openInTab, unsafeWindow
- Enhancements to GM_registerMenuCommand: keyboard shortcuts, stability.
- Memory leak fixes.
- "New User Script" menu item, shortcut to a new blank template for user script authors.
- Restricted GM_xmlhttpRequest from accessing local
The 0.4 branch was an internal development version, where experimentation for security fixes happened.
Security flaw release. Contained no fixes, rather removed all vulnerable features. Intended for (limited) continued use while fixes were being performed.
May 12th, 2005 
- ".tld" support in @include/@exclude, allowing things like
@include http://www.example.tld/for all international permutations.
- Log level option for GM_log
- Minor enhancements and bugfixes.
Primarily bugfix release.
- Edit button in the manage dialog.
- Monkey icon in the status bar, click to enable/disable.
- GM_getValue, GM_setValue, GM_log
Also, the default user scripts that were bundled with Greasemonkey by default until this point were removed.