I kept overlooking this because I was looking for a time and date extension. This has both! Thank you!

please add EST.

nice addon

I love this. I use to work in a call center and it helped me quickly reference what times were in different parts of my Country.

I would suggest an exclusion option to put URL's so that the bar does not pop up. It has caused some issues when software doesn't like the way its displayed and moved down the page a bit

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