You can use userscripts and CSS in the browser, and/or rewriting MITM proxies (when the browser is not as featureful or easy to control), although personally the combination of usefulness and annoyance has to be quite high before I start trying to restyle a site --- not very many qualify.
CSS completely off also tends to produce good results, but usually not for "app-ish" pages.
You can use userscripts and CSS in the browser, and/or rewriting MITM proxies (when the browser is not as featureful or easy to control), although personally the combination of usefulness and annoyance has to be quite high before I start trying to restyle a site --- not very many qualify.
CSS completely off also tends to produce good results, but usually not for "app-ish" pages.