This is an Alfred 3 workflow which gives you access to your Firefox bookmarks. In fact, in aims to mimick the awesome bar by scanning not only bookmarks, but also the input history, cf. the places.db scheme.
The alfred.py module is a collection of helper functions which ease the communication with Alfred. Everyone is invited to use and improve it for other workflows.
Download and double-click Firefox Bookmarks.alfredworkflow.
Just type ff <query>.
Hit return on a URL to have Firefox open it. Hit Cmd + return on a URL to copy it to the clipboard.
This workflow looks for the Firefox places.db according to your setting of PROFILE in the ffscript filter (it's a glob expression, so the wildcards * and ? are allowed). By default, it points to your default profile.