DejaClick for Firefox Quantum

Traditional Plug-ins like DejaClick are not functional beyond Firefox version 56 Currently. You can install a separate version of FF in a separate location locally, however, and use that version to record and playback your scripts. See post below for more details:

https://community.smartbear.com/t5/AlertSite/Important-Firefox-DejaClick-Announcement/m-p/152542#M324