Not an answer, but a warning: I’ve tried a couple of them and they may break some sites and I found very difficult to debug (probably because how many addons I have). If you notice weird things, try disabling the addon.
I just installed the recommmended Consent-O-Matic and it does work in the only website I remember was broken with other addons. Looks promising, thanks!
Update: The native local translation is indeed compatible with Tranquility Reader add-on. They work with both combinations of:
EDIT-2: It works
EDIT: I was wrong, as pointed below, it’s a core feature: https://support.mozilla.org/en-US/kb/website-translation
If you mean the official addon Firefox Translations (AFAIK there is no real native translation on FF, but let me know if I’m wrong), I just did a quick test and it seems to work.
I prefer Tranquility Reader add-on (no need for a 3rd party service). Firefox’ native Reader Mod is not compatible with addons, like translation ones. Tranquility Reader is a bit more configurable too, but that’s just an extra.
CommaFeed, an open source reader:
https://github.com/Athou/commafeed
I use the public instance, which has a limit of 2000 feeds:
https://www.commafeed.com
RSS reader with direct subscriptions to RSS Feeds.
Podcast RSS Feed: What Is It, Why You Need It, How To Get It
I see you posted this article to 4 communities. According to the comments on this post if you use the cross post function (in the default web frontend), it will only show once in the feeds instead of 4 times (which can be a bit annoying).
Thanks
EDIT: post link and aclaration regarding the UI
I’ve only used on the desktop, but there is Proxigram, an alternative frontend for IG.