Check Firefox Bookmarks

Martin Brinkmann
Feb 26, 2009
Updated • May 20, 2017
Firefox, Firefox add-ons

Up until recently there was not a single add-on available for the Mozilla Firefox 3 web browser that would check the bookmarks for invalid or duplicate entries. Several add-ons existed that were able to perform the checks in Firefox 2. The reason for the missing add-ons was a change in the storage location for Firefox bookmarks that was introduced in Firefox 3 that rendered all existing add-ons incompatible.

Check Places is the first Firefox 3 extension that can check all Firefox 3 bookmarks for duplications and invalid references aka dead pages. The experimental add-on can be downloaded right from the Mozilla website after logging in as a user. The new Check Places entry will be added by the Firefox add-on to the bookmarks menu. A click on that link will open a new window that the user can use to configure the scan behavior.

It is possible to scan all bookmarks or only selected folders. Exclusions can be made so that some bookmarks or folders will not be scanned in the process. The scan itself can check if the pages that the bookmarks point to exist and if it is stored more than once in the bookmarks.

The scan does not take long, a few minutes for a few hundreds bookmarks. The results are displayed in a tabbed interface detailing the bookmarks that have returned a page not found error and those that have been recognized as duplicates.

firefox bookmarks

Each Firefox bookmark can be opened and checked individually. The extension will list the return status of the page, e.g. 404 page not found or 500 Internal server error to aid the user in his decision. A simple timeout for example usually means that the page could be back up later while a 404 usually hints at a more severe problem.

Selected bookmarks or all can be deleted in the end to clean the Firefox bookmarks from duplicates and invalid entries. Check Places is a great Firefox 3 extension, must have for every Firefox user that has more than a handful of bookmarks and indispensable for users with hundreds and more.


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  1. Anonymous said on February 28, 2009 at 2:13 am

    Not the first one to have the feature to check Firefox 3 bookmarks for duplications. Bookmark Duplicate Detector could do this since August 7, 2008

  2. dwarf_toss said on February 27, 2009 at 3:34 am

    Lol. Ever think of allowing cookies temporarily?

    Anyhow, this addon needs work. It found some pages of mine to be dupes, so I deleted them. In the end, they were not dupes, but I did cut down on some clutter. heh

    I’d avoid for now unless like me you have sites you more or less don’t care about.

  3. archer said on February 26, 2009 at 10:34 pm

    does not take long?! well, they say time is relative, but if your cookie settings are to ok cookies for each site, it takes forever–actually it make take longer than forever, i don’t know because i gave up after 10 minutes.

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