Firefox issues with Avast! Internet Security [Slow connections, pages wont load]

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Hello!

I just downloaded the 2015 Avast and bought myself a 2 year license of the internet security package.

However, on my Asus laptop, i have this AV installed, and it makes web browsing with my default browser Firefox, terrible. Pages wont load, and if they load, they load after 5 minutes.

Im running windows 8.1
Avast version: 2015.10.0.2208

Solution to my problem is not to disable plugins in my web browser, I simply had to disable the shields in Avast interface, and everything was okay again.

Any idea how i can prevent the issues? I would stop my subscription since it is less than 30 days ago i bought it, unless i know i can fix this.

Thanks for any help, and I'm looking at myself as an advanced user, so I should know what you are talking about.

Regards

[Eddy]

Next month there will be a new version of avast released.
Let's see if the problems are solved.

[Asyn]

- W8.1..? (32/64 Bit..?)
- Other security related software installed..?
- Which AV(s) did you use before Avast..?

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- W8.1..? (32/64 Bit..?)
- Other security related software installed..?
- Which AV(s) did you use before Avast..?

Windows 8.1 64 bit

- I do have Malwarebytes Antimalware Pro installed, but is in no relation with the issue i had. (I did uninstall it to test if it helped.)

I've used Panda Security for 2 days (www.pandasecurity.com), but wasn't satisfied with the results i got, and i've always been a user of the avast software.

Huge edit!:

 By disabling the HTTPS option under the Web shield, I'm now able to browse the internet a bit faster than before. Pages everywhere loads much faster, even without HTTPS.

Thanks to Asyn's Reply in a related topic.

[Asyn]

First, be sure to get rid of all remnants of your prior installed AV(s)..!!
-> https://www.avast.com/faq.php?article=AVKB11

Then:
1. Download Avast Internet Security: https://files.avast.com/iavs9x/avast_internet_security_setup.exe
2. Follow instructions: https://www.avast.com/uninstall-utility (Run this tool for all prior installed Avast versions..!!)
3. Reinstall Avast with the downloaded installer from point 1.
4. Reboot.

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After restarting my computer, reinstalling the software and removing any remainders of third party softwares, Avast is still messing around with my internet speed / loading.

Current state:
- Firefox will not load any pages if the extension is installed (by Avast!), can't get any specific results regarding the  HTTPS scanning.
- Firefox will load SOME pages if the HTTPS option is ticked away / off under the web shield AND if the extension is disabled.
- Firefox will load all pages normally, if the extension is disabled and the HTTPS scanning is disabled.
- The results varies from each restart. Sometimes i end up with all pages loading just after booting into windows again, and after 1-2 minutes, it all hangs up again.


Edit: installed Chrome and IE9 and I found the same problem occuring in those browsers aswell, regardless if the plugin was present or not. HTTPS scanning was disabled, and there are issues loading the pages.