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Firefox is slow no matter what I do!

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  • 4 have this problem
  • 29 views
  • Last reply by FredMcD

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Ever since upgrading to Windows 10, I've been having performance issues with Firefox. I've tried the beta, alpha, and stable versions to no avail. All give me grief. It's to the point I can't rely on Firefox like I can with the others.

It's only certain sites that give me performance issues; for example http://shop.lenovo.com/us/en/laptops/?menu-id=laptops After the images load, it hangs for like 5-10 seconds before it's completely good. Where as other browsers do not hang at all.

Here's what I've tried...

  • Firefox in Safe mode
  • Refresh Firefox
  • Firefox Alpha
  • Firefox Beta
  • Firefox stable build without add-ons
  • Trying the same site on Chrome, Edge, Internet Explorer, and Opera. All work fine except Firefox

Used performance monitor and noticed that my system is barely thinking when running Firefox and loading problem sites. So it makes me think it's software.

My system

Intel I7 5820K 16 GB DDR4 2400 MHz (4 x 4 GB) 512 SSD (Firefox installed on 7200 3 TB HDD) *I tried installing on SSD and HDD) Nvidia GTX 970 Windows 10 Pro Upgrade Comcast 180 Mbps down - 27 Mbps up speed Connection shared through R7000 router with custom firmware BitDefender AV

I enjoy using Firefox more than any other browser and would like to continue to use it. My standard browsing has one tab open at a time and problems occur, but when I work I use approximately 10-15 tabs at one time and I still have the problem on some sites, work related or not, and it's quite frustrating. I know Firefox is free so there's no real complaint here, just offering assistance to help better the product with some rant included :)

Ever since upgrading to Windows 10, I've been having performance issues with Firefox. I've tried the beta, alpha, and stable versions to no avail. All give me grief. It's to the point I can't rely on Firefox like I can with the others. It's only certain sites that give me performance issues; for example http://shop.lenovo.com/us/en/laptops/?menu-id=laptops After the images load, it hangs for like 5-10 seconds before it's completely good. Where as other browsers do not hang at all. Here's what I've tried... *Firefox in Safe mode *Refresh Firefox *Firefox Alpha *Firefox Beta *Firefox stable build without add-ons *Trying the same site on Chrome, Edge, Internet Explorer, and Opera. All work fine except Firefox Used performance monitor and noticed that my system is barely thinking when running Firefox and loading problem sites. So it makes me think it's software. My system Intel I7 5820K 16 GB DDR4 2400 MHz (4 x 4 GB) 512 SSD (Firefox installed on 7200 3 TB HDD) *I tried installing on SSD and HDD) Nvidia GTX 970 Windows 10 Pro Upgrade Comcast 180 Mbps down - 27 Mbps up speed Connection shared through R7000 router with custom firmware BitDefender AV I enjoy using Firefox more than any other browser and would like to continue to use it. My standard browsing has one tab open at a time and problems occur, but when I work I use approximately 10-15 tabs at one time and I still have the problem on some sites, work related or not, and it's quite frustrating. I know Firefox is free so there's no real complaint here, just offering assistance to help better the product with some rant included :)

Chosen solution

So after installing Windows 10 in a VM, I discovered Dashlane was the issue. Dashlane creates a memory leak when the extension is installed and sometimes some residual files remain. I was able to replicate the issue 100% with Dashlane and Firefox and uninstalling the extension doesn't always work.

I had to completely uninstall Dashlane, completely uninstall Firefox, and clear the residual files from them both.

After doing so it fixed the issue. When installing Dashlane again Firefox worked great until I added the extension then the problem returned.

I got in touch with Dashlane and they're going to work on the issue and said they'll get a KB formed.

So for now, I just Firefox's password manager.

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All Replies (6)

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Something's going on with my system. I'll have to investigate. This is closable.

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Good luck.

Perform a System File Check to fix corrupted system files Win 7, 8, 10, Vista: https://support.microsoft.com/en-us/kb/929833

See if there are updates for your graphics drivers https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

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What security software do you have?

It is possible that your firewall or other security software 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 install for Firefox and the plugin-container process and the updater process.

See:

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Chosen Solution

So after installing Windows 10 in a VM, I discovered Dashlane was the issue. Dashlane creates a memory leak when the extension is installed and sometimes some residual files remain. I was able to replicate the issue 100% with Dashlane and Firefox and uninstalling the extension doesn't always work.

I had to completely uninstall Dashlane, completely uninstall Firefox, and clear the residual files from them both.

After doing so it fixed the issue. When installing Dashlane again Firefox worked great until I added the extension then the problem returned.

I got in touch with Dashlane and they're going to work on the issue and said they'll get a KB formed.

So for now, I just Firefox's password manager.

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That was very good work. Well Done. Please flag your last post as Solved Problem so others will know.