A proposito de iste extension

This very small WebExtension will allow you to inject a custom CSS stylesheet into all sites you visit making you the stylist of your web.

Features include:

Inject a custom CSS stylesheet into all websites.
Override the injected stylesheet for each host individually.
Temporarily toggle functionality for the current tab.
See the effects of your changes to the stylesheet while you make them.

The default key combination for toggling functionality for the current tab is ALT+SHIFT+I. Firefox currently lacks a way to change this default combination.

Note that because this is a WebExtension it will not work on sites WebExtensions can't inject CSS into.

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