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Re:Suggest to HN: D A R K M O D E by bananamerica on Thursday December 12, 2019 @04:59PM (#21777012)
This[1] and other links tell me that there are no addons for Firefox on iOS. Sadly, that is what I use.

[1] https://support.mozilla.org/en-US/kb/add-ons-firefox-ios

Re:Suggest to HN: D A R K M O D E by kick on Friday December 13, 2019 @05:38PM (#21786272)
Firefox for iOS has night mode built in.