According to the changelog, since 2017.11.10 this is an empty package.
The package seems to be have been retained for possible future use.
Closing as invalid as its installation will currently have no
discernable affect to anyone installing Firefox.
** Changed in: firefox (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1274605
Title:
Please demote xul-ext-ubufox from Firefox Recommends to Suggests
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