How to disable CSS in Browser for testing purposes

Question

Is there any way I can disable all external CSS in a browser (Firefox, Chrome...)?

When using slower internet connection, sometimes only the bare HTML is loaded by t

Answer 1

On Firefox, the simplest way is via the menu command View > Page Style > No Style. But this also switches off the effects of some presentational HTML markup. So using plugins as suggested by @JoelKuiper is usually better; they give more flexibility (e.g., switching off just some style sheets).