It's been a long road, but a stable, secure, and much improved Greasemonkey is now available for Firefox 1.5. Install Greasemonkey 0.6.4 This is for Firefox 1.5 only and will not install on previous Firefoxen. If you use a Firefox version prior to 1.5, you should continue using Greasemonkey 0.5.3. Some of the changes required for security caused minor API changes. If you are a developer and your s