userscripts

Native javascript equivalent of jQuery :contains() selector

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This should do in modern browsers: function contains(selector, text) { var elements = document.querySelectorAll(selector); return [].filter.call(elements, function(element){ return RegExp(text).test(element.textContent); }); } Then use it like so: contains(‘p’, ‘world’); // find “p” that contain “world” contains(‘p’, /^world/); // find “p” that start with “world” contains(‘p’, /world$/i); // find “p” that end with “world”, case-insensitive …

Apply a Greasemonkey/Tampermonkey userscript to an iframe

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In Greasemonkey (And Tampermonkey and most userscript engines) a script will fire on an iframe automatically if it meets the @include, @exclude, and/or @match directives. And, a popular question is how to stop Greasemonkey from firing on iframes. So, if your script had a match like: @match https://fiddle.jshell.net/* It would fire on jsFiddle “output” pages … Read more

How can I load a shared web worker with a user-script?

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You can use fetch(), response.blob() to create an Blob URL of type application/javascript from returned Blob; set SharedWorker() parameter to Blob URL created by URL.createObjectURL(); utilize window.open(), load event of newly opened window to define same SharedWorker previously defined at original window, attach message event to original SharedWorker at newly opened windows. javascript was tried … Read more

UserScripts & Greasemonkey: calling a website’s JavaScript functions

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Background Doesn’t Greasemonkey inject my extensions JavaScript already? Can someone clarify this for me please. Greasemonkey executes your scripts in a sandbox, which is a restricted environment without direct access to the JavaScript in the page. Earlier versions of Greasemonkey injected scripts directly into the page, but this introduced serious security vulnerabilities. In the old … Read more

Where are Chrome/Tampermonkey userscripts stored on the filesystem? [closed]

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Tampermonkey scripts are super easy to update via the Tampermonkey tab. See the Tampermonkey FAQ, or just try it. Tampermonkey scripts were stored in a special SQLite database and were/are not directly editable in file form. Update: As of version 3.5.3630, Tampermonkey scripts are now stored using Chrome’s extension storage. They are still not editable … Read more

What is the Greasemonkey namespace needed for?

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A namespace is used to avoid naming collisions. If you called your script foobar and someone else did as well, then central repositories would have a hard time telling them apart. Therefore you should provide some URL that you control (i.e. you own it or can administrate it) that basically means “everything with that URL … Read more

Injecting JS functions into the page from a Greasemonkey script on Chrome

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The only way to communicate with the code running on the page in Chrome is through the DOM, so you’ll have to use a hack like inserting a <script> tag with your code. Note that this may prove buggy if your script needs to run before everything else on the page. EDIT: Here’s how the … Read more

Why is usage of the downloadURL & updateURL keys called unusual and how do they work?

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Use of those keys is discouraged mainly by Greasemonkey’s lead developer. Most others, including the Tampermonkey team feel no need for such a warning. Also note that those directives are not always required for auto-updates to work. Some reasons why he would say that it was unusual and that “most” scripts should omit it: In … Read more

Greasemonkey/ Tampermonkey @match for a page with parameters

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@match only works on the protocol/scheme, host, and pathname of a URL. To trigger off the query parameters, you can either use @include or use @match and also test the URL yourself. Note that the @match approach performs faster. With @include, you can use a regex syntax. See, also Include and exclude rules. In this … Read more

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