XUL XPCOM install rdf add on Legacy Extension manifest json WebExtension firefox developer edition

after its end in 2017's Firefox 57 Pale Moon, Basilisk, Waterfox, & other forks retained support for XUL add-ons

BUT adapting is kinda like trying to install a CPM program in a macitosh web server running linux through ms dos

 There is no data. There is only XUL /ˈzuːl/ ZOOL), which stands for XML User Interface Language, is a user interface markup language developed by Mozilla. XUL is implemented as an XML dialect, enabling graphical user interfaces to be written in a similar manner to web pages. Such applications must be created using the Mozilla codebase (or a fork of it); the most prominent example is the Firefox web browser.

https://en.wikipedia.org/wiki/Browser_extension#API_conformity
https://en.wikipedia.org/wiki/Add-on_(Mozilla)
https://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul
https://en.wikipedia.org/wiki/XUL
https://ghostbusters.fandom.com/wiki/Zuul
https://extensionworkshop.com/documentation/develop/porting-a-legacy-firefox-extension/
https://extensionworkshop.com/documentation/develop/comparison-with-xul-xpcom-extensions/
https://extensionworkshop.com/documentation/develop/comparison-with-the-add-on-sdk/
https://developer.thunderbird.net/add-ons/updating/tb68/overlays

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