Speedup Firefox by disabling these 10 most slow performing addons

Mozilla has released a list of 50 slow performing addons which affect the performance of its Firefox browser. Add-ons provide many useful features and functions, but they can also cause Firefox to become slower.

Some add-ons can even slow Firefox to a crawl and make it difficult to use for regular web browsing. If you think add-ons might be the reason Firefox is lethargic, check the list for some of the biggest bottlenecks. And remember, for best performance you should disable add-ons that you no longer use regularly.

Add-ons with Slowest Start-up – The following 10 add-ons have the most impact on how long it takes Firefox to start up:

  • FoxLingo
  • Firebug
  • AniWeather
  • FlashGot
  • FoxClocks
  • FoxyTunes
  • Video DownloadHelper
  • FastestFox
  • Xmarks Sync
  • SimilarWeb

You can see the full list of 50 addons along with details at Mozilla.

If you are a developer, don’t let poor performance affect the experience of your users. Here are a few tips on how to keep your add-ons responsive and nimble.

SpeedyFox, Firefox Preloader, Firefox Booster and Make Firefox upto 3 times faster without spending any money may also interest you.

Posted by on , in Category General with Tags
Anand Khanse is the Admin of TheWindowsClub.com, a 10-year Microsoft MVP Awardee in Windows (2006-16) & a Windows Insider MVP. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.


  1. olivier

    If you go to site you will see a peculiar list.
    It looks like a list of capitalist frenzy.
    Adblock, Youtube, Facebook, Greasemonky, BETTERPRIVACY, etc;
    Firefox is probably getting hit with off the radar complaints.
    Heaven forbid I download Youtube videos !!!!!!!!!!!!!!!!!!!!!!
    This stinks of corporate interests.
    I call up IMDb and get RottenTomatoes scores, who doesn’t get paid; RT.
    You can find a reason for each of them, except some innocents thrown
    into the lot to cream over the deception.
    Firefox PRINT your scores, PRINT your claims.
    Sad. Sad. Sad. Sad. Sad.

  2. I have allowed your comment after editing out the website names. This is a list published by Mozilla. If you have a genuine issue I think you should seriously take it up with them.

  3. Colin

    Dang! I use 3 of the ones on the list. Foxy tunes, Xmarks and fastest fox. About to get rid of them all besides xmarks!:(

  4. Michael

    @olivier: They haven’t suggested that users should disable any plugins which those users find helpful. Only ones which users find they aren’t using often enough to be worth the longer startup time.

    For years people have complained that Firefox startup is very slow. This was in fact true until recently. However, now that the Mozilla team has addressed most of the performance issues related to loading, it’s appropriate for them to point out that the major bottleneck now is with a variety of popular plugins that aren’t optimized for fast initialization.

    Rather than trying to discourage users from using these plugins, they’re helping people understand that plugins can significantly affect loading time, especially when one has many. I believe that by highlighting the ‘worst offenders’, so to speak, it will encourage those plugin authors to look at their own code performance and do what they can to optimize loading time.

  5. Olivier

    Point taken, but do take the time to read the full list.
    The AdBlock plug-in is small but it does bring with it a list of blocked web sites of many hundreds in appdata. I have tried with and without AdBlock using a system timer and a noted Very slight slowdown, but not a user-perceived slowdown. But, I do have a fast machine and I will accept Mozilla comment.
    However, I do find it curious that IE9 does not have AdBlock. Why? Because this plug-in is the bane of the ad revenue model. Keep your real customers happy. For those of you that don’t know, changing the default Firefox/Google homepage is depriving Mozilla of its most important revenue stream, because of a joint marketing ad sharing search strategy.
    Now on to BetterPrivacy. This plug-in is miniscule and carries no weight. All it does is delete Flash Cookies when you exit Firefox. My timer detected no discernable start-up load. Mozilla gives a valuation of 1%. So why include it? What company doesn’t like the idea of permanent cookies.
    But my biggest surprise is those not on the list.

  6. Olivier

    Since you are fastidious editors. This is personal to Windows Club. Why do accept the hype at face value. Please try and look beyond their marketing department. The page says in its subtext “We here at Firefox are not quite where we would like to be in terms of performance but it’s not really our fault, just all those plug-ins on our Most Popular list. Also, Firefox is moving to a more closed development model more similar to Chrome with more frequent updates. This of course means that our communication with independent developers will become even more sporadic. So your perceived problems with our plug-ins will probably not go away.”
    Today, for the average user experience, the three top browsers are identical. They even look the same. What made Firefox was the “plug-in” and a certain fanboy, anti-Microsoft mentality. That is going away fast.
    It is possible to import AdBlock lists into IE9 and my perceived user experience is enhanced over Firefox. For Chrome even more so.
    Moral: Look in the mirror before shooting at your most loyal fan base, the independent developers. Might as well shoot your own foot.
    PS: I am on the beta team of one of the most popular themes for Firefox 3, and the developer is having a very difficult time getting long-term workable info.

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