Windows: If you're a devotee of Firefox's add-ons and features but would like just a tad more operation speed, Pale Moon might be perfect, at least for a trial run. The custom and extension-compatible Firefox build seems just a bit snappier.
It's a relative measurement, of course, to note that Pale Moon, built and compiled specifically for Windows operation, tests out 25 per cent ahead of Firefox in certain SunSpider rendering and scripting tests. As we've noted in our browser speed tests, browser testing suites can be subjective, and don't always translate to real-world experience. Then again, using Pale Moon for the better part of a morning, I could guess at feeling pages like Gawker.com and Slashdot loading a tad faster than in Firefox, which I kept open for side-by-side testing. Pale Moon should work with most of your extensions, too, and if you install it in a non-portable fashion, it picks up your exiting Firefox profile and runs with it.
Pale Moon is a free download for Windows systems only. Tell us how it performs for you in the comments.