Only accepts input up to FFFF -- the upper plane is not accessible here.

I *hate* to say this, but: you can insert Unicode characters *directly* from the keyboard - at least in Windows - without having to use an extension. Just hold down the Alt key, type the Unicode code, and release the Alt key... I use the degree (°) symbol ALL the time - it's 0176. All this, without having to take your hands off the keyboard to grab the mouse, click the button, and type the code.

I gave it 3 stars to be neutral/kind -- because it works, and took work -- but isn't really necessary. (It might be helpful for Mac and/or Linux, I haven't checked, so there's that. However, the description should point out that, for Windows users at least, it actually adds work, and inform them how to do it with the Alt key....

Sorry - trying to be helpful to others, not harsh your buzz. Good-on-ya' for doing the work, anyway.

When the unicode entry box pops up, the cursor should be in the box so you can type. Instead, you have to grab the mouse, point it in the box, and click first.