Upper case, or lower case?

I've been using Firefox for over 5 years now and I don't think I've ever seen this message?

There has been a handful of times when a page just won't work correctly and I have to switch to edge, but that is super rare and has probably been less than 10 occasions

Some have a simple led indicator so you know roughly when you need to charge.

• red = low
• orange = medium
• green = full