Mozilla Labs has released a new update for F1, the Firefox extension that eases content sharing on the web, by adding a button to the toolbar you can press to share links in popular social networks and web mail services.

F1 0.7.5 adds support for LinkedIn and allows twitter and Facebook direct messages. The most important change is in the interface however, as the sharing panel is now a bubble over the content instead of a top bar as before.

F1 only supports Firefox 4 betas. So if you aren’t digital living on the edge, this is the right time to start with a double dose. Get Firefox 4 beta and F1.