Firefox add-ons

Crest does not install Firefox add-ons from addons.mozilla.org.

Extensions in Crest for Mac run on the Chromium engine, which runs Chrome extensions from the Chrome Web Store. It cannot load a Firefox .xpi package. WebKit pages, and Crest on iPhone and iPad, run no extensions.

Many Firefox add-ons also publish a Chrome version. Look for the same extension in the Chrome Web Store and install it from there. See Install from the Chrome Web Store.

If you installed Firefox add-ons in an earlier version of Crest, they do not carry over. Install each extension's Chrome version into the Space you want.