I wish this would just let me add a bunch of clocks without having to pick timezones for specific places and then let me manually add/substract timezones with -/+ buttons or something. That would be much easier than that tree menu and having to pick the right timezones right away.
Also, let me pick another flag to my convenience.
The pop-out list from the button doesn't show times in the chosen time format. (Maybe the bar did, but that was before FF 57.)
Add option to hide the button to remove entries in the pop-out list.

تو ایران اینقدر زندگی کیری شده که حتی دونستن ساعت و تاریخ کشور خودمون هم بدردمون نمیخوره!

It was great for a long time, but last 6 months or more on some sites the panel is either not visible at all or it is blocked partially by some parts of the site (its under the textbox and such). I'm SO tired of this. Sometimes i even forget that i have it installed. Please fix it...
UPD: For Christ sake, its been about 15 months now ! Please please please, fix it!.. Its one of the most useful addons and its broken for forever, nothing to replace it with, it seems.
UPD: "World Clock (Digital and Analog) by Senthil Ponnusamy" is almost good enough. I'll have to use it instead for now.

¿Por qué tantos permisos para un simple reloj? No tiene sentido >:\

FoxClocks de Andy McDonald

FoxClocks de Andy McDonald

Working on a global service FoxClocks is a core part of my day. I love the ability customize so much, it makes my day so much easier when I need to see what time it is in any of my data centers.

From time to time I do have issues with websites that have content in their footer but the Fall 2020 update has corrected over 90% of the issues I did encounter.

Thanks for the great product!!

Simple, elegant, accurate!