I'm having Trouble with the Scripts and Greasemonkey

User Help for Mozilla Firefox
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Joined: March 8th, 2019, 11:07 pm

Post Posted March 9th, 2019, 9:18 pm

I'm having Trouble with the Scripts and Greasemonkey
Everything looks like its in Order but nothing is Working.


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Joined: September 23rd, 2004, 8:57 pm
Location: Somewhere on the right coast

Post Posted March 10th, 2019, 10:06 am

What version of Firefox?

Posts: 3164
Joined: February 3rd, 2009, 6:29 pm

Post Posted March 10th, 2019, 11:02 am

A csp problem?

You can disable csp temporarily for testing with the security.csp.enable preference.

Content Security Policy

Scripts will not run


Try the Tampermonkey extension. It's working correctly in Firefox 65.


Code: Select all
// ==UserScript==
// @name         Test
// @match        http://**
// @grant        none
// ==/UserScript==

(function () {

  "use strict";

  var style = document.createElement("style");
  style.type = "text/css";
  style.textContent = [
    "* { background: #000000 !important; }",
    "* { color: #CCCCCC !important; }",
    "a { color: #FFCC66 !important; }",
    "a:link { color: #FFCC66 !important; }",
    "a:visited { color: #FFB720 !important; }",
    "a:hover { color: #FFFFCC !important; }",
    "a:active { color: #FFFFCC !important; }",
  if (document.head) {
  } else {


Test page



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Joined: December 19th, 2004, 12:26 am
Location: Silicon Valley, CA USA

Post Posted March 11th, 2019, 2:33 pm

In the legacy version of Greasemonkey, it was possible to totally disable the extension and all scripts by clicking the monkey button on the toolbar. Not sure if there is anything similar to that in the WebExtensions version.

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