Just installed this experimental add on to my Firefox, and all I can say is this is TRANSFORMATIVE. Amazing. Rocks. If you are a computer power user, social webbie, use twitter, want to easily translate web pages, add things to email, including maps, food reviews, want to in one stroke map out locations on craigslist or with one stroke make bookmarklets into power commands, highlight text and do things like email, translate, etc. without cutting and pasting and opeing apps...you need to check this amazing Mash Up extension out - replaces a ton of extensions in one and does things heretofore not possible on the web. FOR REAL!