Installed this plugin and a few hours later MalwareBytes flagged it as adware. Deleted it.

Edit: Just realized it doesn't show ANY plugins. At least it shows the theme so I'll leave it at 3 stars, but should really be 2.5 since it only does exactly half (2.5/5) of what it says it does.

Not perfect on showing plugins, but for basic data as a web developer trying to see info a site is using, it fits the job.

Działa wyśmienicie :)

Thanks developer this extension that it's compatible with Firefox 57+.