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Why is the newest Firefox 12 so much slower than Firefox 3.6.28 and why do they all crash?

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New Contributor

Why is the newest Firefox 12 so much slower than Firefox 3.6.28 and why do they all crash?

I love Firefox but of late the fastest Firefox they have is 3.6.28 which the fools have decided to discontinue upgrading! I started with Firefox 12, slow/crash. 11, ditto, 10.2, slow, 9 back to 4, slow as crap/crash crash crash! Looks like 3.6.28 will be it for me and live with the crashes. If addons are the culprit, Firefox should test 'em and ban the incompatible ones. Dunno why I'm asking again because unless I can talk to the makers of Foxy I'll get no concrete answers anyway. Foxy and Mozilla are the only browsers on the web that do not have email addresses for troubleshooting problems! Wish I could find a better browser than Foxy! Used to love it but now it's just plain BS! I depend on Henrietta for my livelihood (survey work, web ads surfing &c) and I need a reliable browser. Looks like Foxy ain't it and IE i even worse! Opera's great only incompatible with most of the sites I need to use! Any suggestions at all? Thanks I hope- keimanzero Scion of Anime of PA. Oh a word to the wise- if you use Web of Trust get rid of it! You'll need a special uninstall tool but WOT blocks every single site as unsafe and that includes this one and Firefox!

23 REPLIES
Regular Contributor

Re: Why is the newest Firefox 12 so much slower than Firefox 3.6.28 and why do they all crash?

Hello keimanzero, I am sorry to hear that you are experiencing issues with Firefox, but I don't think there is much to be done to resolve them... You might want to scan your system for viruses or malware and maybe clean-up your PC so it goes a little faster. Other than that, you could launch Firefox in Add-Ons-disabled mode or remove some unneeded ones. As to why Firefox is slower than 3.6.28 I think it is due to the resources they use on your computer. 3.6.28 was very stable as it was a LTS (Long-Term Support) release and it was very simple, compared to the latest versions. As to the crashes and bugs, Firefox 12 is very recent and it is only a bridge to the next few releases that will bring many interesting and useful features to the web browser. While it is true that Mozilla does not provide direct support through customer support representatives to their users, they do provide a pretty good knowledge base and a strong community that is ready to help and support them. I hope that I could maybe illuminate you a little bit and on a side note, I have to say that I myself don't like WOT very much for their warnings and inaccurate ratings of some websites.

Site Moderator

Re: Why is the newest Firefox 12 so much slower than Firefox 3.6.28 and why do they all crash?

A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.

Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.

See:


Create a new profile as a test to check if your current profile is causing the problems.

See "Basic Troubleshooting: Make a new profile":

There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.

If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.

See:

New Contributor

Re: Why is the newest Firefox 12 so much slower than Firefox 3.6.28 and why do they all crash?

I have installed Fx12, Fx 10.0.4ERS, Fx13 beta, Fx13 aurora. I find Fx12 start fine, but after a time get very slowly to browsing or to get to the active focus. I noted in about:memory an network-memory-cache error (negative value, only in Fx12), i disable java and go away, but the slowness remains.

I test the other with the exact same profile(going to the profile directory and copy the release profile to the others) and all of them are very speedy.

I made an aditional test loading 7 pages(from a bookmark) at the same time and they delayed: Fx12 125s,Fx ERS 44.5s, Fx Beta 34.5s, Fx aurora 37.5s Fx12

Regular Contributor

Re: Why is the newest Firefox 12 so much slower than Firefox 3.6.28 and why do they all crash?

I have heard that Firefox 15 was extremely fast and it has a lot of new interesting features to bring to the web experience. I guess we will have to wait until then for a noticeable speed change...

New Contributor

Re: Why is the newest Firefox 12 so much slower than Firefox 3.6.28 and why do they all crash?

To use Fx ERS until the new release then

Site Moderator

Re: Why is the newest Firefox 12 so much slower than Firefox 3.6.28 and why do they all crash?

Natrist, there is noting even close to a Firefox 15.0 release yet as it was only started a couple days ago on the unstable Nightly channel that is meant for devs and testers.

Regular Contributor

Re: Why is the newest Firefox 12 so much slower than Firefox 3.6.28 and why do they all crash?

Yes James, but I have developer friends from the Ubuntu community that told me that it was going to be pretty amazing and that there would be great improvements to the speed and that it was hitting pretty hard on SunSpider benchmark, if I am not mistaken.

New Contributor

Re: Why is the newest Firefox 12 so much slower than Firefox 3.6.28 and why do they all crash?

I removed all the Add-ons with the exception of: Addblock Plus, All-in-One Sidebar and Web Mail Notifier. Firefox 12 is now back to normal speed.

New Contributor

Re: Why is the newest Firefox 12 so much slower than Firefox 3.6.28 and why do they all crash?

You shouldn't have to make a new profile with a new version or disable necessary addons to get it work how it should.

Each version gets worse and worse, even on a high-end pc.