I don't keep this addon enabled all the time. But I do enable it at times to do quick security checkups on all the addons I have. Simple yet effective.

Great add-on that summarizes all your extension permissions on one page. Developer responded very quickly to my suggestion to show Private Browsing permission.

This extension doesn't report permissions clearly. To see it it's enough to compare what is stated on Ghostery extension page and what Project Insight reports: the important permission "Access your data for all websites" isn't reported explicitly, while others don't present details.
Consider use alternative listed in https://security.stackexchange.com/questions/41254/how-to-view-extension-privileges-in-firefox

Edit (after developer's response): The explanation is not really a fair justification of the omission, because the whole interface is tuned to the perception of an inexperienced user - with the exception of the most important information! The inconsistency could be easily eliminated by reporting the permission in question similarly to the rest of them (+ "Access URLs" list).
In fact, I would suggest adding elaborated explanations based on examples on https://support.mozilla.org/en-US/kb/permission-request-messages-firefox-extensions (perhaps as text displayed on demand).
Main text and stars corrected taking into consideration the developer's response.

It does its job.

The author has updated the addon to fix the issues I manetioned above.
It now works on FF61.0.1.

czytelne i przydatne

Does mostly what it says on Firefox 62, but won't show the all_urls permission or any permissions on disabled extensions. Grouping by permissions and open-sourcing the code would be nice too :)

Clearly not intended for API which are released in v52 and below; nightly only.
Needs a warning/experimental flag until the time that v53 is released as stable.

Do not give weight to my score: it doesn't, as expected, work on my machine but I am leaving it installed and disabled.

works for FF 56 since the 0.2.5 update (wasn't working previously)

Works as advertised, FF Nightly 63

This extension doesn't work on my French Firefoxes 61.0.1 and 56.0.2 (both 64bit). Extension panel is empty. Have you a bug tracker?