Hello Win 10 forum members,

I am in need of advice for Mozilla Firefox v 73 browser on my PC;I have noticed since Moz FF Quantum browsers have switched to WebExtension format addons after FF v 57 (??) and would like to know how i may allow an "XPI" format addon to work in a FF Quantum browser without the browser deferring to a WebExtension addon preference(this quantum browser is forcing to use a WebExtension format addon instead of the XPI format older addon version!!)??

I have had good luck with XPI addons on other Windows NT HDDs without WebExtension forcing itself as primary addon format but am having issues on another HDD that has yet to only allow Chrome CRX file format addons to work properly on my PC Chrome browsers(!?!?!?!) ; but also have same issues(password manager defers to latest update in chrome store instead of allowing the older version extension from functioning!!) with Cent Browser (64 bit,Version 5.0??).

BTW...my windows 10 pro build number is:19041

Thanks in advance for your help and solutions to this FF older version/Cent Browser addon issue!!