Please read the codes in the User.js file properly before using.

How to use:

download the whole repository as zip file and unzip it.
Open your firefox browser.
In the url bar, type about:profiles and press enter.
Go to root folder of the profile default release section.
There click the open folder option. This will direct you to your file manager .
Now copy and paste the User.js file there.
Then, make a chrome folder and paste all the files from the downloaded chrome folder inside the new chrome folder.
Close the Firefox browser and reopen it. All the changes will be applied.