TamperMonkey Tutorial | Add Custom JavaScript to YouTube.com

How to change a website with your own code? A beginners lesson about practical Greasemonkey scripts.

In this tutorial, I will show you how to inspect the YouTube source code to alter it with JavaScript code injected using a Tampermonkey app / plugin / add-on. This method works on both Firefox and Chrome. You can learn from it as a follow along tutorial to then implement your own scripts altering the webpages of your choice. Such Tampermonkey scripts are useful for displaying additional data / information or for autocompletion of forms to speed up your workflows.

[heyiamuday]

Your explaination is very good & clear
nice script experiment

[mr_mackey_mvoyez]

loved this video man, too bad you stopped posting, would watch more

[jvkqxdr]

Hello, I need to customize a script that works with the TamperMonkey plugin. The script has the function of clicking on a calendar and going directly to the end of the month.

[KrevetkaOo]

does this script still work for you? could you share?

[Immortal-pugr]

Hi anyway to auto comment on youtube live video, so far I have made the input and automated to click the submit button, but the comment is not being posted.

[rossli]

Just what I was looking for. But a small suggestion: maybe you should try to replace all `var` with `let`. For example, I think in the `run` function, if you just use `var`, console may tell you that `videos` is not defined.

[dominikgameplaytv]

Record how to add Tampermonkey Filmot title Restorer script from Restore and Movie and Channel and Playlist

[tonypetruzzi]

instead of the hack... you could have just converted the string to a json object.

[mohammedalhamadi]

Thank you. This is very useful. Is there a way I can support you?

[mckboard]

Is there a method I could contact you. Would be willing to compensate, looking for some help on a project. TY!!

[gvxuhup]

thank you for sharing the information 🙂🙂how can i create a website script on site ; tls contact fr ??

[Mastertradebro]

Brother i want to talk to you 1v1 how can. I talk ?

[siouaneislem]

I wish you keep making userscript videos. and tutorials, and explaine alot more if you can.

[TheBaltLT]

who makes tutorials with distracting talking head? how does this add value to tutorial where focus is of essence??