How to increase the speed of your mozilla firefox by 500%

30 replies
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To increase the speed of your mozilla firefox browser this is just how I did mine:

Open firefox and type 'about:config' in the address bar
Alter this settings: network.dns.disableIPv6 set this to true
network.http.max-connections Set this to 100
network.http.max-connections-per server Set this to 100
network.http.max-persistent-connections-per-proxy Set this to 100
network.http.max-persistent-connections-per-server Set this to 100

100 is a random higher number I chose to ensure that firefox isn't waiting on the connections, especially on pages with many image hosts, avatars e.t.c.

#500% #firefox #increase #mozilla #speed
  • Profile picture of the author Bruce Hearder
    A great little utility that I have used to make my FF run faster is

    FireTune (

    I can't say its increased my FF's performance by 500%, but is nice and easy and I don't have to fiddle any config settings..

    Worth checking out..

    Take care

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    • Profile picture of the author Karen Blundell
      funny you should post this but I did a few tweaks to my Firefox config just yesterday and boy what a difference. I also found out I was infected by the zsearch rid of it too! So now my Firefox is blazing fast!
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  • Profile picture of the author qubex
    9 chances out of 10 if you're having an issue with your Internet browser, it's because of an issue with your connection/Ethernet port, virus/malware, or hardware performance.

    Try doing some frequent cleanings, such as Internet and temp directories, removing unneeded start-up processes, and run a regular defrag.

    Personally, I reformat my PC once a month.
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  • Profile picture of the author coolhobo

    I've just updated Firefox with your suggestion, I'll see how I get on with it from now on.

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  • Profile picture of the author qubex
    Originally Posted by n7 Studios View Post



    Yes, they get full of rubbish over time, but once a month?
    I do a lot of environment testing on my PC... installing junk and uninstalling junk, constantly.

    I've got 2 500gb hard drives on a disc array. They are partitioned in such a way that I've got all my OS files on one HD, while my paging file, installed apps and backups are on another. This way, I simply backup my registry and reformat my OS partition. Very little overhead, and makes the system run smooooth!

    Suppose I could just run a virtual machine, but that would be too easy :p
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  • also try this;

    In the address bar, type "about:config" and press enter. Do not include quotation marks. Step2
    In the filter field, type "network.http." Find the Boolean labeled "network.http.pipelining" and check its value. If the value is "false," double click this line to change it to "true." This will help reduce page loading time.
    Find the Boolean labeled "network.http.pipelining.maxrequests." Double click this line and change the number to eight. The default number is four.
    Find the Boolean labeled "network.http.proxy.pipelining." Double click this line to change the value to "true."
    Enter "network.dns" in the filter field and find the Boolean labeled "network.dns.disableIPv6." Double click this line to set it to "true."
    Right click anywhere in the window, select "new" and then "Boolean" from the menu. In the field that pops up, enter "content.interrupt.parsing." When prompted, set the value to "true." This allows your browser to interrupt page parsing, making it even more efficient.
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    • Profile picture of the author bamsgenx
      Does it realy work?
      But, thanks anyway. it is a great tips. i will try it first

      no signature yet

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  • Profile picture of the author mr2020
    Thank you for the great Tweaks for Firefox!
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  • Profile picture of the author Alex G.
    thanks for the tips.
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  • Profile picture of the author bz1406
    Thanks for the tips's work for me!
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  • Profile picture of the author spearce000
    Whoa! That is quick.

    Thanks for sharing.
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  • Profile picture of the author stevephilipps
    Interesting information, although i would have just thought that if you wanted a faster internet, it would be best to get a faster router, that is, until i heard this.
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  • Profile picture of the author UMRK
    Wow! what difference. Thanks
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  • Profile picture of the author brandonhess
    Thanks for the info. I would always like to have my internet browsing faster. I will give it a try. I will try to remember where this is and repost my expiriences with it.
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  • Profile picture of the author Daveone
    Thanks Oluwaseun, I tried it and it worked.
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  • Profile picture of the author Jerry-Leventer
    Here's a site I found that also shows you how to speed up and fine-tune Firefox,


    See my blog for more info: Jerry Leventer Internet Marketing Blog

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    • Profile picture of the author Jerry-Leventer
      You should backup the prefs.js file in your profile before making any changes. Find the file on an Windoz XP system here:
      C:\Documents and Settings\<user>\Application Data\Mozilla\Firefox\Profiles\

      The prefs.js file is viewable with a standard text editor, and you can use SourceForge's WinMerge to look at the differences between files.

      You can use the FEBE plugin to backup your entire profile.


      I changed my prefs to the following as recommended by original post,

      user_pref("network.http.max-connections", 100);
      user_pref("network.http.max-connections-per-server", 50);
      user_pref("network.http.max-persistent-connections-per-proxy", 50);
      user_pref("network.http.max-persistent-connections-per-server", 50);

      But after running FireTune utility prefs were reset to the following,

      user_pref("network.http.max-connections", 48);
      user_pref("network.http.max-connections-per-server", 16);
      user_pref("network.http.max-persistent-connections-per-proxy", 16);
      user_pref("network.http.max-persistent-connections-per-server", 8);

      See my blog for more info: Jerry Leventer Internet Marketing Blog

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  • Profile picture of the author GunniEff
    Amazing, this really work? maby not 500% but a lot faster.....

    Gunnar Finnsson
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  • Profile picture of the author jtrag
    Setting all those numbers that high are bound to get you banned by certain servers for too many connections at one time. Beware of the risks of using tweaks such as these.
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  • Profile picture of the author Cpt Jack Sparrow
    Completely screwed up My Firefox ... After using these settings FF took ages to load (initial loading) plus web pages took forever or sometimes timedout ... I had to restore FF to its default settings and its working perfect now ... I wouldnt recommend these settings
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  • Profile picture of the author AtomicFlipper
    Nice tips, but I have to agree, some servers are going to block you eventually.
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  • Profile picture of the author netbie
    great tip, thanks a lot.
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  • Profile picture of the author Gimme4Free
    Seen this before, great tips, just got my new laptop so will be setting this up again now
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