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Editors' Note: The Download Now link will prompt a local download of the Firefox extension. To install the extension directly, open the file using your Firefox browser.

Editors' Review


Flash adds multimedia effects to Web sites, but not everyone wants that. Some people find Flash animations annoying or distracting, or they're concerned about privacy and security. And for some, it's all of the above. Developers have responded with a variety of tools designed to block all or some Flash animations from loading. We took a look at Flashblock, a free Flash blocker for Firefox and other Mozilla browsers as well as related browsers such as Netscape. It blocks Flash, Shockwave, and Authorware in both Macromedia and Adobe versions.

After we installed Flashblock and restarted Firefox, the first thing we noticed was the "F" logo placeholder instead of blocked content in our animated weather gadget. Browsing to several other major Web sites that use Flash technology confirmed that Flashblocker was preventing Flash content from loading. Moving the cursor into the blocked content's placeholder frame changed the F logo to a Play button. When we clicked it, the blocked content played normally. Flashblocker didn't block non-Flash content like images and other forms of animation, nor did it keep pages from loading quickly and completely (except for blocked content). We accessed Flashblocker's tabbed options via Firefox's add-ons manager. These options are minimal, chiefly consisting of a check box to also block Microsoft's Silverlight and a whitelist for adding sites allowed to run Flash.

Even if you've got lots of bandwidth and PC power, there are Web sites so choked with animations that they never seem to stop loading. Try throwing Flashblock at them. It proved an effective tool for blocking animated ads and other Flash-powered nuisances, yet we could view any blocked content we wished just as easily as playing a video.

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Publisher's Description

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User Reviews

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5 stars

"Solution to problems of youtube and flashblock & others"

April 03, 2015  |  By thumbsup2

 |  Version: Flashblock 1.5.17


Consumes little resource. Allows for individual flash playing. Easy to use. Has whitelist options. Works for older browsers too.


I don't have cons.


If you are having any problems using this with Youtube or other places, know that there is a fix. All you got to do is search Google for "Fix For Firefox Flashblock And Youtube Click Problem" and you will find the Tech Notes visual guide/How-To/article. Include the Quotation Marks when doing the search. Do that and you got your fix and another too. I think solutions are there (meaning Tech Notes) for Firefox, Palemoon, Torch, Windows, Linux, etc.

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Full Specifications

What's new in version 1.5.17
  • [fix] Bug 24896 Allow whitelist for some sites. Patch by Tommy Wu.
  • [fix]Re-enable whitelist integration with Adblock Plus and other content blockers.
  • [fix] Don't enable controls for HTML5 video/audio since some sites (Youtube) have their own video controls.
  • [new] Add option to enable/disable HTML5 video blocking.
  • [fix] Bug 25350 Flashblock on Firefox 21 is broken by mozilla Bug 834697 (Enable XBL Scopes).
  • Updated translations from Babelzilla.
  • General
    Publisher Lorenzo Colitti and Philip Chee
    Publisher web site
    Release Date September 17, 2013
    Date Added September 17, 2013
    Version 1.5.17
    Category Browsers
    Subcategory Firefox Add-ons & Plugins
    Operating Systems
    Operating Systems Windows XP/Vista
    Additional Requirements Firefox: 2.0 - 4.0b8pre.
    Download Information
    File Size 106.78KB
    File Name External File
    Total Downloads 42,307
    Downloads Last Week 64
    License Model Free
    Limitations Not available
    Price Free

    Previous Versions:

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