Can't you open the Addo-ons website at all or is there only a problem with downloading and installing extensions?

You can check for issues with security software and certificates.

What security software do you have?

Boot the computer in Windows Safe mode with network support (press F8 on the boot screen) to see if that has effect.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/
• http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10

There is security software like Avast and Kaspersky and BitDefender and ESET that intercept secure connections and send their own certificate.

Separate Issue; Your System Details shows;

Installed Plug-ins

Shockwave Flash 19.0 r0 Shockwave Flash 17.0 r0
Having more than one version of a program may cause issues. You must remove the older programs. Then get the current full installer.

Note: Edge on Win10 does not use ActiveX version but its own Flash.

Flash: Grab the uninstaller from here: Uninstall Flash Player | Windows Uninstall Flash Player | Mac

Then reinstall the latest version.

Flash Player Version 19.0.0.245
https://www.adobe.com/products/flashplayer/distribution3.html Note: Windows users should download the ‘’’active_x’’’ for “Internet Explorer,” and the ‘’’plugin’’’ for “Plugin-based browsers” (like Firefox).

Adobe still offers Flash 18.0.0.255 as its extended support release further down

The Add-ons page ("Get Add-ons" section) works indirectly with the Add-ons site and there may be additional security issues installing that way. Can you use the site itself:

https://addons.mozilla.org/firefox/

cor-el said

Can't you open the Addo-ons website at all or is there only a problem with downloading and installing extensions? You can check for issues with security software and certificates. What security software do you have? Boot the computer in Windows Safe mode with network support (press F8 on the boot screen) to see if that has effect.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/
• http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10

There is security software like Avast and Kaspersky and BitDefender and ESET that intercept secure connections and send their own certificate.

I cannot open the addons website at all using firefox. I can access the link using other browsers though.

I am using nod32 ver 9 and malwarebytes ver 2.2. Good idea with safemode, I will try and report back

cor-el said

Can't you open the Addo-ons website at all or is there only a problem with downloading and installing extensions? You can check for issues with security software and certificates. What security software do you have? Boot the computer in Windows Safe mode with network support (press F8 on the boot screen) to see if that has effect.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/
• http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10

There is security software like Avast and Kaspersky and BitDefender and ESET that intercept secure connections and send their own certificate.

FredMcD said

Separate Issue; Your System Details shows; Installed Plug-ins Shockwave Flash 19.0 r0 Shockwave Flash 17.0 r0
Having more than one version of a program may cause issues. You must remove the older programs. Then get the current full installer. Note: Edge on Win10 does not use ActiveX version but its own Flash. Flash: Grab the uninstaller from here: Uninstall Flash Player | Windows Uninstall Flash Player | Mac Then reinstall the latest version. Flash Player Version 19.0.0.245
https://www.adobe.com/products/flashplayer/distribution3.html Note: Windows users should download the ‘’’active_x’’’ for “Internet Explorer,” and the ‘’’plugin’’’ for “Plugin-based browsers” (like Firefox). Adobe still offers Flash 18.0.0.255 as its extended support release further down

I am using windows 7 sp1 and have reinstalled just one version of flash, still nothing.

cor-el said

Can't you open the Addo-ons website at all or is there only a problem with downloading and installing extensions? You can check for issues with security software and certificates. What security software do you have? Boot the computer in Windows Safe mode with network support (press F8 on the boot screen) to see if that has effect.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/
• http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10

There is security software like Avast and Kaspersky and BitDefender and ESET that intercept secure connections and send their own certificate.

FredMcD said

Separate Issue; Your System Details shows; Installed Plug-ins Shockwave Flash 19.0 r0 Shockwave Flash 17.0 r0
Having more than one version of a program may cause issues. You must remove the older programs. Then get the current full installer. Note: Edge on Win10 does not use ActiveX version but its own Flash. Flash: Grab the uninstaller from here: Uninstall Flash Player | Windows Uninstall Flash Player | Mac Then reinstall the latest version. Flash Player Version 19.0.0.245
https://www.adobe.com/products/flashplayer/distribution3.html Note: Windows users should download the ‘’’active_x’’’ for “Internet Explorer,” and the ‘’’plugin’’’ for “Plugin-based browsers” (like Firefox). Adobe still offers Flash 18.0.0.255 as its extended support release further down

jscher2000 said

The Add-ons page ("Get Add-ons" section) works indirectly with the Add-ons site and there may be additional security issues installing that way. Can you use the site itself: https://addons.mozilla.org/firefox/

No i cannot, it just won't load. If i paste that into any other browser it will connect though.

As an extra note, when I go into cmd.exe and type in ping addons.mozilla.org

I get message:

Ping request could not find the host addons.mozilla.org.

When I ping directly through my modem it pings it.

When I ping from the command prompt, I get:

C:\>ping addons.mozilla.org

Pinging olympia.prod.mozaws.net [54.149.87.253] with 32 bytes of data: Reply from 54.149.87.253: bytes=32 time=43ms TTL=48 Reply from 54.149.87.253: bytes=32 time=44ms TTL=48 Reply from 54.149.87.253: bytes=32 time=43ms TTL=48 Reply from 54.149.87.253: bytes=32 time=44ms TTL=48

Ping statistics for 54.149.87.253:     Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds:      Minimum = 43ms, Maximum = 44ms, Average = 43ms

A web-based DIG shows:

addons.mozilla.org. 60 IN CNAME olympia.prod.mozaws.net. olympia.prod.mozaws.net. 60 IN A 54.149.87.253 olympia.prod.mozaws.net. 60 IN A 52.27.130.229 olympia.prod.mozaws.net. 60 IN A 54.68.16.226

That's part of the Amazon cloud. I don't know why some browsers would be able to ping it, but neither Windows nor Firefox can contact it.

Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options) key, and then starting Firefox. Is the problem still there?

Start your Computer in safe mode with networking. Then start Firefox. Try Safe web sites. Is the problem still there?

Starting The Computer In Safe Mode;
Free Online Encyclopedia

You can try a different DNS service.

• http://kb.mozillazine.org/Error_loading_websites#DNS

Tried safemode with networking and nothing loaded, but my internet was connected. I tried all browsers and it was the same.

cor-el said

You can try a different DNS service.

• http://kb.mozillazine.org/Error_loading_websites#DNS

Btw i forgot to mention, I use Opendns and have used it even when firefox still worked. Just suddenly one day something happened and I couldn't access the page.

Now that I think of it I do have sometimes a problem where images won't load on some websites I used to visit (on any browser). Probably related.

I will try the things in that article now, thanks for the link

Yeah nothing is working, i tried everything in this thread. This sucks especially because I really like firefox and use it on all my devices. I can usually figure out problems but this time I am struggling. In addition to everyone's suggestions I checked my hosts, reinstalled my anti virus and malwarebytes, added the link to exclusions, added to windows firewall exclusion (even though its disabled and still nothing.

• 1 Download Firefox For All languages And Systems v42 {web link}
• 2 Uninstall Firefox from your computer {web link}
  DO NOT remove your profiles.
• 3 After, reboot the computer. Then run the full installer.

FredMcD said

• 1 Download Firefox For All languages And Systems v42 {web link}
• 2 Uninstall Firefox from your computer {web link}
  DO NOT remove your profiles.
• 3 After, reboot the computer. Then run the full installer.

I've already tried this many times. I uninstalled using revouninstaller and removed registry entries and all left over files. I even added ccleaner registry cleaner to the mix and reinstalled. Still nothing.

Remove History For One Site Open the History Manager <Control><Shift> H. In the search bar, enter the name of the site. Right click on one of the listings and select Forget About This Site. This should remove all information, including any passwords / settings.