Installing on Edge

Install the ScriptCat extension from the Chrome Web Store.

Open the browser’s extensions list, then click the three-dot menu next to the extension

Click Manage Extension in the menu

In the ScriptCat extension details page, find the Allow User Scripts option and enable it. Then disable and re-enable the extension, or restart the browser to make the script functionality effective.

Toggle the Developer mode switch on the left side

After enabling developer mode, restart the browser to make the script functionality effective.

Once ScriptCat is installed, and your browser restarted, install the OhMyMathpad userscript.