[Bug] Can't Undo with '⌘+Z' if I accidentally clear all the styles

[KiranCNayak]

Describe the bug

When I was trying to edit the styling, I accidentally selected all and deleted them. Now I can't Undo this action by doing '⌘+Z', which is very annoying. Good thing that I keep a backup of stylebot.json file.

Browser

Firefox (109.0.1) on MacOS Monterey (12.6.3)

To Reproduce

Steps to reproduce the behavior:

• Select All of the text in the stylebot textbox and clear it.
• You can't undo this action.

Expected behavior

I want normal behaviour of UNDO action.