User Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:39.0) Gecko/20100101 Firefox/39.0 Build ID: 20150708164734 Steps to reproduce: Select 'Bookmarks / bookmark this page' Actual results: The 'Add bookmark' dialog appears.It is very small. I have a large 'tree' of bookmark folders and use informative long names for bookmarks and folders. The tiny dialog only shows an extremely small window onto the Bookmarks Folder Tree and this makes it very awkward to try and navigate. This small size appears to be fixed. :-( Expected results: The user should be able to expand the Bookmarks Dialog by dragging it from the corners - exactly as you CAN do if you open it by the alternative method of right clicking on a tab and selecting 'Bookmark all tabs'

Thanks for taking the time to report this! Does this also happen with a new and empty profile? See http://support.mozilla.com/en-US/kb/Basic%20Troubleshooting#w_8-make-a-new-profile and http://support.mozilla.org/kb/Managing%20profiles

I can confirm, that the bookmark doorhanger is not resizeable, but in the folders list I can click on "Choose..." to get a lager window.

So I created a new profile and I see no change with this problem. sjw@gmx.ch >click on "Choose..." to get a lager window. Yes I was aware of that, but it is only of marginal extra utility as the new window is only a small amount larger. I have a large screen area that is going to waste and my eyesight is not getting any better. Please consider this as a Request For Enhancement. :-)

Thanks for clarify. I'll confirm this as a feature request.

Can confirm this is not yet fixed in Firefox 53 (Dev Edition). One of the last things that really bug me about Firefox as I use Bookmarks a lot and the add dialog is just too small.