This simple add-on allows users to drag:
- texts: search in foreground/background tabs
- links: open in foreground/background tabs
- images: open in foreground/background tabs
- customize the search engine
- disable fire-drag on some websites
PS: Need to reload webpages after the installation
source code: https://github.com/erictsangx/fire-drag
link: https://addons.mozilla.org/en-US/firefox/addon/fire-drag