This is a really cool addon, but like others reviewers, I think it will be cool to allow the user add/change icons and tags.
It is possible in a easy way :
- get the xpi (it is on the user profile folder, or download it with another browser)
- rename .xpi to .zip
- unzip it.
- To change tag names, go to chrome\content\taglist.js and replaces the names
- To change tag icons, go to chrome\skin\icons and do what you want.
- re-zip, rename with xpi, drag an drop in the browser.