Users trying to install Foxmarks today may receive an "Invalid Install Package" error message. This is due to a (hopefully temporary) problem that has cropped up as Mozilla migrates their add-ons site to the newest version.
We hear that the problem should be fixed within the next hour. If you're anxious to get started (and hey, who wouldn't be?), you can download from our site directly. You'll have to add our site to the list of the approved download sites: when the warning bar appears at the top of your browser, press "Options" and then "Add Site" and then click the download link again.