Any add-on that blocks sites using a layover?

I would like to block certain sites like Reddit for the sake of productivity. Most of the site blockers that I have found do not use an overlay to block the sites. The sites just get redirected to a moz-extension:// URL. This interferes with my pinned tabs and I cannot reload the tabs to load the original URL when I pause the extension during breaks.

Do any of you know any add-on that fit the above description?

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