I used to, but the increasing amount of 404ing in my bookmark collection led me to stop trusting that I could get back to something with it. I think I'd prefer a "whole page snapshot" rather than a bookmark.
To prevent 404'ing an Archive service can be used. But I feel that is a little abusive to archive the page then bookmark the archive, so I take whole page screenshots. :)
In Firefox: Shift+F2 --> 'screenshot --fullpage'
I use evernote's web clipper for that purpose, works pretty well for what I need it to do.
Any page I want to bookmark, I commit to the Internet Archive, and then bookmark that page.
I only bookmark a page when I want to add extra tags to find it by that don't appear in its URL or title. Otherwise, Firefox's "awesomebar" does an excellent job of finding what I want out of my history.
The shitload of people typing in "facebook" in the Google search bar m(