Just a few days after realizing that the new Stumbleupon Toolbar had the function to save every new website that you "stumble" as a Firefox bookmark and that it provided the option to import all (older) Stumbleupon sites into Firefox I literally stumbled upon a similar solution on the social bookmarking site Delicious.
Del.icio.us is a online bookmarking service that registered users can add websites to. A small description and tags can be added to those websites and an account is required to store them online.
Update: The process has changed a bit. When you are on Delicious click on the Hamburger menu icon in the top right corner and select settings from the menu that opens.
Switch to the manage tab on the settings page. There you find the option to import and export bookmarks.
You can include tags and notes when you export the bookmarks.
To import all Delicious bookmarks into Firefox do the following. Head over to Delicious and select settings > export/backup to save all bookmarks as a HTML file to the local system. Make sure to include the tags. A click on Export To HTML starts the process.
You can import the bookmarks straight away into Firefox using the browser's Bookmarks Manager. It is possible that you end up with duplicates though. If you want to avoid those, you need to merge the Delicious bookmarks with a copy of your Firefox bookmarks first to eliminate all dupes.
Export all bookmarks of Firefox 3 as a JSON file as well. This can be done in the Bookmarks Manager under Organize bookmarks and there by clicking on the Import and Export button.
Now that you have both files saved go to the website that combines both bookmarks and merges them so that only one bookmark file is left in the end that can be imported into Firefox again.
The new file is in JSON format as well, the format that is the default Firefox format for storing bookmarks. The import of that merged bookmarks file is done in the same menu as the export mentioned above.
Update: The merge bookmarks website is no longer available.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.