The entire list of bugs handled in this release is also available via the 0.9.9 milestone on GitHub. Note that as always it takes some time for Mozilla to review the new version, but it's available on the all versions page immediately.
If you are using it and notice problems, it's best to either let us know at greasemonkey-dev or log an issue (and be clear that it's with this version).
- Pressing 'back' could rarely cause a script to run twice on the same page. (#1083)
- Extended characters would get corrupted in new scripts. (#1236, #1315)
- A full disk could cause loss of data (especially config.xml). (#1301)
- (Affecting 0.9.8) Scripts would not install (all scripts in Firefox 3: #1389, always for certain scripts: #1391)