If you don't want to use any extension to backup your Firefox bookmarks, then you can use this tutorial. I use this trick to set a separate location for my firefox bookmarks. I set this location to a drive other than windows drive, so that if windows get corrupted or I have to reinstall windows, I'll not have to lose my Firefox bookmarks.
Following are the required steps to follow:
1. First export your Firefox bookmarks for only one time and save the file to a location, which you think is safe. To export Firefox bookmarks, go to Bookmarks -> Show All Bookmarks menu or press Ctrl+Shfit+B keys together. It'll open Bookmarks manager. Now click on Import and Backup -> Export Bookmarks to HTML option.

2. Close Firefox and type %appdata% in RUN or startmenu search box and press Enter.
Now go to:
\Mozilla\Firefox\Profiles\random_character_and_numbers.default
3. Now open prefs.js file and add following line at the end of this file:
user_pref("browser.bookmarks.file", "E:\\Setup\\bookmarks.html");
NOTE: Here, "E:\\Setup\\bookmarks.html" is the location, where I have stored the bookmarks file, change it to your desired location and make sure to use \\ instead of \.
That's it. Now Firefox will automatically use the above mentioned file for storing your bookmarks and you'll not need to take care of your bookmarks ever.
This article was posted by VG in following section: Mozilla Firefox.
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Fahd
There is a firefox extension named "Foxmarks". We need to make an foxmark account and from there on, foxmark will make sure that all your bookmarks are kept safe on its server, it will update them as new bookmarks are added. And bookmarks can be retrived on any pc by using that foxmark account.
Will
What about MozBackup? Google it. It will backup not only your bookmarks but addons and settings too. It not only works for Firefox but for Thunderbird too.
Cheers
Ron
Dear Vishal,
This is great stuff. I am very picky about my privacy, so I will not be giving another party my bookmarks to make statistical data. I also do not have the need for third party software that performs the above function but utilizing more resources to do so.
This is great as I constantly have to remind myself to update my backup and replace the old. This is a huge time saver for me as I have literally thousands of bookmarks.