Firefox: 50 Slow Performing Add-ons (link no longer active)

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Editors Note: the link for this article is no longer active.

If you're thinking Firefox has become slow and sluggish these add-ons could be the culprit.

From the Mozilla Add-ons page:
"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 below for some of the biggest bottlenecks. And remember, for best performance you should disable add-ons that you no longer use regularly."

Here's the current list of add-ons that can cause Firefox to slow down. They are listed in order, with worst products first. For actual numbers on the degree of performance degradation check the current bad boys list at Mozilla which is regularly updated. In the last 24 hours the list dropped from 50, then to 7, then to 6 add-ons.

  • #1 Firebug
  • #2 FoxLingo
  • #3 FoxClocks
  • #4 FoxyTunes
  • #5 Video DownloadHelper
  • #6 Xmarks Sync

One additional thing I've seen that can really slow Firefox down are Flash cookies. These cookies are persistent and use Adobe's Flash to store their data in browsers. Flash cookies aren't deleted when you delete cookies from Firefox (or other browsers for that matter). Firefox add-on Better Privacy can detect and delete these cookies in Firefox, but that leaves other browsers wide open.

I've been using a small utility called KFC (Kill Flash Cookies) for quite some time now. It will delete any Flash cookies it finds and isn't browser dependent. It's a free download and works with Windows, Mac and Linux - you can get it here.
KFC is a stand-alone program, so it won't install anything on your system.
The download is a zip file, so you'll need to unzip it on order to run it.
KFC comes in either a command line or GUI version for all three operating systems.

Slow Performing Add-ons for Firefox
 

Off for now,
Rhiannon

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