Hi Kevin, Firefox does not include an ad blocker when you install it. That's an add-on you would get separately.

Firefox includes a feature that can block certain content so it looks like you are using an ad blocker, that's Tracking Protection, which is part of Content Blocking. I'll link you to an article on that: Content blocking.

When you're on a site, check the left end of the address bar to see whether a "shield" icon has appeared. Click that to check the Content Blocking status and see whether you need to make an exception for the site.

Also, thank you for sharing your extensions list. I don't know whether "Skip Redirect" could affect ads. ??

But there's also an indication you run Kaspersky. Kaspersky's "Anti-Banner" feature could block some ads. It may also have other blocking features. You might want to check your Kaspersky settings to see whether adjusting those helps with the complaining site.

KevinDakin said

I wish for a simple answer, Firefox.

Hmm. I don't' know if this is going to be a simple answer, but here I go:

First, you're not 'talking' to 'FireFox'. This is a Voluntary Support Forum where other FF users are answering questions. The Mozilla Creatures are usually not here.

Your Extensions:

• Skip Redirect 2.2.1
• Stylish - Custom themes for any website 3.1.8
• Video DownloadHelper 7.3.5
• Kaspersky Protection 20.0.543.1053d-... (Inactive)
• Kaspersky Protection 5.0.141.23d-... (Inactive)

You should delete older versions of an Extension, and not keep duplicates. Skip ReDirect: Seems like that could cause navigation problems. Download Managers can cause problems and freeze-up navigation and could prevent a site from loading.

For troubled Websites not opening or are blank: See Deleting Site Info.

Next, for regular, favorite sites, set-up Cookie Permissions/Exceptions:

Manage Permissions:

Go to Menu > Options and enter in the Options Search Box, Site Data. Click on Manage Permissions and in there add:

https://WhatEverWebSite.com (The 'problem' site)

and then again with:

WhatEverWebSite.com (The 'problem' site without the https)

...then Save it.

You might want to repeat the above and Make an Exception and Allow for Pop-ups on the site. Look for 'Block pop-up windows' in the Options area and click on Exceptions.

~Pj