I believe you want the following CSS code:

*::-moz-focus-inner {
	border-width: 0 !important;
	border-style: none !important;
	padding: 0 !important;
}

This code should work if you put it into a userContent.css file, which you can set up the same way that you would set up a userChrome.css file on Firefox.

You'll have to restart Firefox to see the change.

Before you bother making the change, you may want to visit this demo website first to see if the code actually works for you. On the demo page, the buttons on the left should have the problem that you are referring to, but the ones on the right should be fixed. If that's the case, then the code above is almost certainly what you're looking for.

Hope this helps.

Hi, thanks for the reply, I have used your code, but I'm still seeing the dots everywhere. I need to understand where that comes from. The demo page you have sent worked fine and I didn't see any dots in it.

Did you check these focus_ring prefs on the about:config page ?

• browser.display.focus_ring

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• https://support.mozilla.org/en-US/kb/about-config-editor-firefox

Thank you so much, it worked, I have changed .focus_ring_style and .focus_ring_width to 0, and now I don't see that thing anymore, cheers!