Exploring Firefox Cache: A Bunch Of Really Cool Tips

Ann Smarty 16-10-2010

The browser cache temporarily stores images, scripts, and other parts of websites while you are browsing. This is normally a good thing because this enhances performance and load time.


The browser cache usually works behind the scene: you are unlikely to notice it even exists unless you feel like digging deeper.

But do you know that you can actually have quite a bit of fun viewing your browser cache? Do you know why and how you can clean it? Today’s tutorial is just about that: what you can do with your Firefox cache.

Viewing Your Firefox Cache

The cache statistics and directory location can be viewed in about:cache. Then:

  • about:cache?device=memory – Lists memory cache entries.
  • about:cache?device=disk – Lists disk cache entries.

It is really not easy to make sense of that interface but luckily we have an addon to make it easier.

CacheView [No Longer Available] is a GUI Front-end of “about:cache”. It allows searching and sorting memory and disk cache files. CacheView gives you a preview pane for any images, and makes it really easy to save MP3s and flash files from the sites you’ve visited.


After you have it installed, just go to Tools ->CacheView (or just use the shortcut Ctrl+Shift+C) and you will be presented with a nice table containing your cache files and a preview pane.

The table is sortable by column (key, size, MIME Type, storing device, Last Fetched date) and what’s more it has a search function which adds a lot of sense to your cache database:

firefox cache

You can also right-click on an entry and delete it. It won’t delete things if the page is still opened in one of your tabs.


firefox cache viewer

CacheSearch is another useful cache addon for FireFox which can search through the full-text of cache records:

firefox cache viewer

Clearing The Firefox Cache

There are a few reasons why you may want to clear the Firefox cache, including privacy concerns and technical problems. I usually do it when I have any issues with a website: problems on sign-up, incorrect interface loading, etc.


Clearing the Cache Manually

Official Guide:

  • Navigate: Tools -> Options -> Advanced panel -> Network tab
  • In the Offline Storage section, click Clear Now.

firefox cache viewer

FireFox Addons:

If you find yourself clearing the cache too often, you can find this little addon helpful [No Longer Available] (which we have previously mentioned in a post on optimizing Firefox Optimizing Firefox (Best Picks: Shortcuts, Speedups, Extensions) Read More ): it adds a button to your browser toolbar – with it you can clear the cache with one click of a mouse.

firefox cache folder

Note: After installation, you will need to manually install the button to where you want it to be. For that, right-click on the sidebar and select “Customize“.


Here’s an alternative addon that can be used for that: Cache Status [No Longer Available] which will both monitor your cache statistics for both memory and disk devices and allow to clear it any time:

firefox cache folder

Clear The Cache Automatically:

  • Navigate: Tools -> Options -> Privacy panel
  • In the drop-down select “Use custom settings for history. “
  • Select the check box for Clear history when Firefox closes and in the Settings next to this check box select Cache:

FireFox cache

More Tips On The Firefox Cache:

Do you have anything else to add? Please share your Firefox cache tips in the comments below!

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  1. VkWaVe
    October 21, 2010 at 2:02 pm

    very informative. Thanks for sharing :)

  2. Anonymous
    October 21, 2010 at 8:03 am

    Cool. Could we find video files in the cache?

    • Ann Smarty
      October 21, 2010 at 9:38 am

      Yes, you can easily do that using the CacheView addon. I tried saving a .flv (flash video) file using the tool. It saves correctly but gives the get_video file a .htm extension which I had to manually change to .flv. Other than that its works fine.

  3. Jony
    October 17, 2010 at 10:48 pm

    very usefull ..tnx!