With Firefox Quantum I noticed a "glitch" on loading the CSS of some websites. One of these is my company's website: Or Github too: In the first one, we have only one CSS file in the <hea...

How can I emulate the media type "print" in the new Firefox Quantum dev console? Tried to enable it somehow and searched the documentation but couldn't find any hints!

Pre-version 57 of Firefox had many wonderful add-ons for REST API testing. These REST clients no longer work with Firefox Quantum. While I found some simple, pre 1.0 add-ons in Quantum (click...

As title. For example, when i go to https://jsonplaceholder.typicode.com/comments, the json array is like this How can I make it all automatically expanded? So that I can view everything at onc...

For the company I work at, I have to develop an addon that takes screenshots of the page and then puts a watermark on it with a timestamp. Is it possible to use Firefox's own screenshot function ...

I'm writing a web extension works on firefox. I want my icon works similar to the behavior of Firefox built in "Take a screenshot". The screenshot icon appeared in different colors when it shown in...

I've been looking everywhere but cannot find a way to disable the search from the Address field in the Firefox Quantom. No problem adding a search bar, but that doesn't negate the search from the ...

We are having issues targeting Firefox Quantum when it comes to CSS. We know that the following: @-moz-document url-prefix() { .my-style{ } } ...will target all Firefox browsers, but we just ...

Since updating firefox we now have small (x) buttons appearing in the input as part of firefox's UI controls. Is there any way I can hide/remove these buttons using css? You can see this on the f...

I have this Greasemonkey demo script: // ==UserScript== // @name GM_getValue, GM_setValue don't work demo // @version 0.2 // @author You // @include /^https:\/\/stackoverflow.com/$/ // @grant GM_ge...