I know I've got a lot of bookmarks, but it is supposed to help me get rid of the dead ones and duplicates, so that is exactly what I want it to do.

But Firefox always crashes after about 4,000 are checked, 2,700 warnings and 300 errors.

So why, Mr Developer, don't you add the ability to select which folder of bookmarks to check? Or specify a number of bookmarks to check and then stop, so we can deal with some of the checked bookmarks before it crashes Firefox?

...just an idea.