How do i get the sidebar extension ID

[TriDEntApollO]

So I have a couple of extensions pinned in my sidebar and I want to change the icon of one of them. I discovered that the icons are specified in the one_left-sidebar.css file but the problem is idk how to get the extension id of the extension whose icon I want to change. Can anyone help me out with this one?

Here is a picture for reference:

[TriDEntApollO]

Nvm found the way, had to Enable remote debugging and Enable browser chrome and add-on debugging toolboxes in the Web developer Tools settings.

Here is an firefox support forum post for reference: https://support.mozilla.org/en-US/questions/1242687