Resize, obvious and required feature. Rated 4 out of 5 stars
It's great that this addon gives you the basic option of being able to resize the Firefox bookmarking dialogue. Though lets face it Firefox is lacking so severely in this regard and many others it's getting ridiculous how many addons are needed just to keep Firefox sensible lately.
While it's a welcome feature it would be nicer if it did more, perhaps replaced the archaic bookmarking dialogue with something better altogether with better features like, the dialogue not closing if it looses focus, allow the user to move it around, allow the user to copy text from the page they're bookmarking so they can paste it into the description of the bookmark they're creating, auto collapse all bookmark directories so it doesn't have to be done manually or else they will eventually all be expanded making it harder to find the location you want to store the new bookmark.
This is one of the features in Firefox where just about anything you throw at it would be an improvement.
It would make the addon more worthwhile adding such features other than just being able to resize something which should be there to being with.