How To Disable Dynamic Image Resizing In Firefox

Martin Brinkmann
Nov 23, 2010
Updated • Dec 7, 2012
Firefox, Image

You may have noticed that Firefox changes the size of an image on the web based on the size of the Firefox window. This can be easily tested by opening an image in the browser and modifying the size of the browser window. Firefox automatically adjusts the size of the image. Some users may prefer that the browser does not manipulate the images, so that they are displayed in the intended size regardless of the size of the browser window.

Take the Ghacks logo for instance. You will notice that resizing the window in Firefox after loading the image will reduce the size of the image automatically; Firefox resizes the image dynamically.

If the browser window is large enough the image is shown in its original size.

If the browser window is resized, the image is resized dynamically as well.


Firefox has a configuration setting for that. To make the change enter about:config in the Firefox address bar. First time users need to click the I'll be careful button.

Enter the parameter browser.enable_automatic_image_resizing in the filter list and double-click it to change the value from true to false. Firefox will dynamically resize images if the value is set to true. A value of false will show the images always in their original size regardless of the browser window size.

browser enable automatic image resizing

The change is enabled immediately. Open tabs need to be reloaded once for the change to become active though.


Why would someone want to make the change? It makes sense for very large images, that exceed the screen resolution. Users who want to view those images in their original size need to download them to the computer to do so, as Firefox resizes the images automatically. Making the preference change allows those users to view the images directly in the web browser.


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  1. Ken Saunders said on January 27, 2014 at 10:28 am

    I read your article for JPEG & PNG Stripper (tried the program), and that seems to work pretty well.

    I don’t use (as far as I know) any of CNET’s sites or services any longer.

    Metability Software’s website >
    Metability ® QuickFix for Microsoft Windows® ( previously known as FileMind® QuickFix)

    I downloaded it, but I haven’t installed it.

    Thanks for the info and article.
    See, I don’t just come here for the Firefox content.

    One more thing, I like being logged in here and not having to fill in info to comment. :)

    1. Martin Brinkmann said on January 27, 2014 at 2:30 pm

      The reason why I did not post the site link directly was that Bitdefender blocked the site for me. That’s also the reason why I wrote today’s second article, ha ;)

      1. Ken Saunders said on January 27, 2014 at 2:43 pm


  2. GK said on January 27, 2014 at 9:45 pm

    I use Imagemagick’s Mogrify from the command line.

  3. Design Instinct said on January 28, 2014 at 6:56 pm

    Photo Demon is a cool portable image editor/batch processor. It has a default setting in options to strip some or all of the EXIF data. Once set, you don’t have to remember to strip your data each time.

    Version 6.2 is coming out soon. You can test out the beta. He’s getting rid of the MDI interface.
    Also going to be fixing a bug with high DPI mice. 6.2 crashed on me due to this.

    6.0 is rock solid though. Very nice program.

    Martin, you may want to review it.

  4. ozone333 said on February 1, 2014 at 6:02 pm

    The download link from CNET only provides a stub installer. The way I used to get the actual file without the stub installer was to go to .

  5. webfork said on May 24, 2015 at 10:08 pm

    FileOptimizer also zaps JPEG and PNG metadata: … as well as cutting down dramatically on file size.

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