TagSieve (兼容Firefox 4.0b2pre，官方开发版，前身是TagSifter)

I've been working on fixing all the issues with various changes done to Places and other areas in Firefox 4.0. There are a few issues still remaining (addonmanager support, migrator fixes etc.) but I guess it's good enough to release it so that all minefield users can at least use it and provide some feedback as well.

I'm attaching an xpi here. Please try it out and let me know if it works fine so I can add it in the files section for everyone else. Also, keep in mind that things may stop working as more changes are done in Firefox core (Once the beta is officially released, things should hopefully get stable)