Free
Loki for Firefox
Location-based search and Virtual GPS for Internet Explorer
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Efficient Bookmarking with Fast Dial
Efficient Browser Management Tool
Integrate your del.icio.us account into Firefox
Collaboration Made Easy with ProjectForum
Enhance Your Browsing with Chromifox
Enhanced Browsing with FoxTab for Windows
View multiple pages at the same time in Firefox
Enhance Browser Experience with Aging Tabs
Enhanced Browsing with Extended Statusbar
Sxipper: Free Add-on Tool for Windows Browsers
TICKnTALK for Firefox: Essential Browser Add-on