|Developer(s)||Mitchell Kapor, Todd Agulnick, Penny Campbell, David Loftesness|
|Platform||Internet Explorer, Google Chrome, Mozilla Firefox and Safari|
|Type||Browser synchronizer and Browser extension|
|License||Proprietary commercial software|
Xmarks, formerly Foxmarks, was a San Francisco-based company which produced an add-on to web browsers, which is also entitled Xmarks. The company was founded in 2006 by Mitch Kapor and was acquired by LastPass in December 2010.
The Xmarks bookmark synchronizer is an extension for Mozilla Firefox, Internet Explorer, Google Chrome and Apple Safari (on OS X 10.5 and 10.6) that synchronizes bookmarks between computers, can also synchronize passwords, open tabs, and browsing history (Firefox only). Opera support has not been directly implemented as of 2015  but the Chrome extension is available in Opera via a workaround. As of April 2009 it was one of the most popular Firefox add-ons, attaining over 150,000 downloads per week and almost 15 million total downloads.
In March 2009, Foxmarks was relaunched under a new name and service called Xmarks. Since Xmarks is a superset of Foxmarks, Xmarks includes many new features like suggested tagging bookmarks.
On September 27, 2010 it was announced that, due to the company's current financial projections resulting from its purely voluntary-donations funding-basis, in January 2011, Xmarks would be entirely discontinuing its service. On Sept. 30th, Xmarks CEO, James Joaquin, noted that he had been "pleasantly surprised by the volume of interest" that has been expressed since his initial "closing-announcement". This interest has been shown by both potential buyers of the company, and by those who have thus far pledged to subscribe to the service at the site's "pledge page". At their donations page, Xmarks attempted to acquire pledges from 100,000 of their users to pay $10–20 per year for a proposed "premium Xmarks service" which launched on 9 December 2010. To the date October 7, 2010, Xmarks investors had invested $9 million into the Xmarks project, but with a return on this investment not yet clearly in sight, unless sufficient pledges are received by October 15, 2010, apparently these initial investment funds are reaching an end-point.
On December 2, 2010, the password-management service LastPass acquired Xmarks. Since this acquisition the program has been minimally updated, primarily fixing bugs, and has not had a single new feature added. On October 9, 2015, LastPass was acquired by LogMeIn, Inc. for $125 million. After the acquisition, LastPass stated that they plan to continue to support Xmarks.
Xmarks domain blocked in India
Starting in May 2012, the xmarks.com domain was blocked by major ISPs in India by court order,[clarification needed] resulting in various websites appearing with only a simple message "Access to this site has been blocked as per Court Orders." 
Xmarks provides an option to encrypt bookmarks while they are in transit between the browser and the Xmarks server. Individual users' bookmarks are kept private from other users. However, there are clearly issues of privacy and trust in sending bookmarks to a third party. Xmarks does provide an option for the user to avoid the Xmarks server, by using their own WebDAV or FTP server to store their bookmarks, but this option is only available with Firefox.
- "Mitch Kapor on Foxmarks". Mozillalinks.org. Archived from the original on 2011-07-24. Retrieved 2010-10-07.
- "LastPass Acquires Xmarks!". Xmarks Official Blog. Retrieved 2010-12-31.
- "Xmarks download page for all supported browsers". Download.xmarks.com. Retrieved 2010-10-07.
- "Xmarks for Firefox, now with History Sync". Blog.xmarks.com. Retrieved 2010-10-07.
- "Re: Opera Xmarks Extension". forums.lastpass.com. 2015-05-07. Retrieved 2015-11-12.
- "Re: Will Opera be supported soon?". forums.lastpass.com. 2015-07-24. Retrieved 2015-11-12.
- Xmarks (formerly Foxmarks) stats on addons.mozilla.org
- "Foxmarks is becoming Xmarks". Blog.xmarks.com. 2009-03-02. Retrieved 2010-10-07.
- "End of the Road for Xmarks". Blog.xmarks.com. 2010-09-27. Retrieved 2010-10-07.
- Lowensohn, Josh (2010-09-30). "Xmarks may live on, in paid form". News.cnet.com. Retrieved 2010-10-07.
- "Xmarks is Dead. Long Live Xmarks?". Blog.xmarks.com. 2010-09-30. Retrieved 2010-10-07.
- "LogMeIn buys LastPass for $125 million". The Verge. Retrieved 16 October 2015.
- "LogMeIn's Acquisition of LastPass FAQs". LastPass Help Center. Retrieved 18 January 2016.
- Pahwa, Nikhil (2012-05-11). "DailyMotion Blocked In India On RCOM; Airtel & RCOM Block Bookmarking Site Xmarks". MediaNama. Retrieved 2012-09-02.
And it gets bizarre...
- "Indian ISPs block Vimeo, Pirate Bay and other torrent sites". Firstpost.com. 2012-05-17. Retrieved 2012-09-04.
- Saxena, Anupam (2012-05-17). "Updated: Airtel Blocks Vimeo, DailyMotion & All Major Torrent Sites In India Following John Doe Order". MediaNama. Retrieved 2012-09-04.
- Sushubh, Mittal (2012-05-17). "Now airtel broadband is blocking a bunch of file sharing and regular websites". techwhack. Retrieved 2012-09-02.
(see court order pdf on this page)
- Parfeni, Lucian (2012-05-17). "More Indian ISPs Block Torrent Sites, Dailymotion, Even Xmarks". Softpedia. Retrieved 2012-09-02.
- "BYOS « Xmarks User Manual". 2013. Retrieved 8 October 2013.