There are two solutions that I’ve found to make Firefox expand this dialog by default, one is an extension and the other is a Stylish script, so we’ll go over both solutions.
Using the OpenBook Extension
Download and install the OpenBook extension from Mozilla Add-ons, and after rebooting Firefox you’ll see that the bookmark dialog is now open by default:
There are also a bunch more useful options available in the ridiculously tall Options window:
The most interesting thing here is that you can set Firefox to automatically bookmark into a particular folder by selecting the “Add bookmark to folder below” option.
Using Stylish Tweak Method
If you’re a fan of the Stylish extension you’d probably prefer to just add another user style instead of a separate extension. You won’t get the extra features, but it does save you some extension bloat.
It’s as simple as installing the Add Bookmark Dialog user style… click the button to load into Stylish:
And now you’ll see that the default dialog is changed. You can customize the width / height in the script if you’d like, which is something you can’t do with the OpenBook extension.
Disabling The Stylish Tweak
Because this user style is for the user interface, it won’t show up in the regular Stylish popup, so you’ll have to go into Manage Styles.
You should see the “Add Bookmark Dialog” style in the list, and just remove the check from the left of it.
Don’t forget that you can just drag bookmarks straight off the address bar and onto the bookmarks bar, which is really the simplest option.
