Any time content is blocked, sites may accuse you of using an ad blocker. But that's not the only possible explanation.

You could start your investigation here:

(1) Built-in Tracking Protection feature (especially in private windows).

Do you see a shield icon toward the left end of the toolbar when this problem hits? More info on how to use the shield to manage blocking: What happened to Tracking Protection?.

(2) Content blocking extensions such as Adblock Plus, Blur, Disconnect, Ghostery, NoScript, Privacy Badger, uBlock Origin or uMatrix.

Some of these provide toolbar buttons to manage blocked content in a page.

You can view, disable, and often configure or remove extensions on the Add-ons page. Either:

• Ctrl+Shift+a (Mac: Command+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons
• type or paste about:addons in the address bar and press Enter/Return

In the left column of the Add-ons page, click Extensions. Then cast a critical eye over the list on the right side. Any extensions that Firefox installs on its own are hidden from this page, so everything listed here is your choice (and your responsibility) to manage. Anything that could be blocking content from other sites ("third party" content)? If in doubt, disable.

Any improvement?

I have the same problem

I do not have any software or tool ad blocker, but I'm having trouble that only sites on Firefox find a blocking ad for me

When I try any other Explorer, it's very normal

Is there an ad blocking tool builtin the new Firefox releases

Hi algbre, please review the previous reply for details about Tracking Protection.

https://support.mozilla.org/questions/1198516#answer-1060904

Thanks for coming up such a solution to disable inbuilt adblocker in firefox browser. Till now I have tried adzsafe which can be used to disable adblock on any browser. Adzsafe removes adblocker instantly from any browser that has adblocker installed. But I will surely try this technique. As its steps are easy to use and seems effective.