Is there a way for me to sync bookmarks between Firefox and Chrome on several different Ubuntu machines?
Edit: Even willing to run something on my own web server if that makes a difference.
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XMark does what you want very well. I used it across multiple machines, multiple platforms, multiple browsers. Standard features are free. There's a premium version that supports mobile devices (iPhone, Android, Blackberry etc...).
Maybe you can use Delicious for that:
There are plugins both for Chrome and Firefox.
If you don't like your bookmarks to be public, you can mark them as private (or at least you could before, I haven't used for a long time).
As far as I know you can't... Chrome synchronizes with the Google servers, Firefox with the Firefox servers (or your own server, but I've never tried it)... You can sync Firefox with Ubuntu One, but then again it won't affect Chrome.
I tried to get this working myself, but so far came up empty. But if anyone knows a not-too-complicated way, please do not hold back. :)
If you only need to sync between Firefox and Chrome, you can use Google Bookmarks and the GMarks add-on for Firefox. Just put your current bookmarks in Chrome into Google Bookmarks, and then when using Firefox, install the GMarks add-on. GMarks will allow you to use your Google Bookmarks in Firefox.
Another alternative could be using Netvouz.
Netvouz is a social bookmarking service that allows you to save your favorite links online and access them from any computer, wherever you are. Organize your bookmarks in folders and tag each bookmark with keywords. Access them quickly on your own personalized bookmarks page.
Netvouz allows you to create a neat little bookmarks page that you can easily access no matter what web browser you use to always have your bookmarks at hand.