Here’s a couple under the radar security addons I found others may be interested in.

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Both are small addons and single purpose.

PunyCodeChecker... https://addons.mozilla.org/en-US/firefox/addon/punycodechecker/

This one protects against IDN homograph attacks with a warning screen
You should set "network.IDN_show_punycode" in about:config to true, then you can see **real** address in the url bar.

CSS Exfil Protection... https://addons.mozilla.org/en-US/firefox/addon/css-exfil-protection/

This one shows if the page contains the attack with counter badge on the addon icon.

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