That's still a built-in Firefox feature: View->Page Style->No Style. The same menu will also let you choose between different "alternate style sheets" for the same site. (I think it may even be sticky, per-page or per-site.) Just for example, you could try it out here: http://www.slimy.com/~steuard/teaching/tutorials/Lagrange.ht...
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Older Opera browser versions (and Firefox/Chrome with plugins) allow you to deactivate CSS. Then you see the website as you want it.
That's still a built-in Firefox feature: View->Page Style->No Style. The same menu will also let you choose between different "alternate style sheets" for the same site. (I think it may even be sticky, per-page or per-site.) Just for example, you could try it out here: http://www.slimy.com/~steuard/teaching/tutorials/Lagrange.ht...