Rated 4 out of 5 stars

It works! Simple, easy to use. Limited number of themes, but much better than TB built-in dark theme which makes URL not clear when selected.
Suggest 1) More theme options (15 instead of only about 8)
Suggest 2) Offer option to remember chosen Frame-White theme (i.e. make it default theme)

This review is for a previous version of the add-on (63.7). 

Hello, 3rdRockGuy. ^^

Thank you for nice review, good suggestions.

1) What colors would be good for combination?
Ah, are RGBs in frame and white in toolbar, sidebar, popup good?
2) It could be possible if using if...else...clause before theme APIs.

Would you wait some days or weeks because I have primary job.

March 2nd 2021.

Sungho.

Version 63.8.

1) I will reserve Tb built-in themes (Dark/Light theme) as default.
2) I will load white theme and popup window at the same time as soon as you click browserAction.
3) I will add RedWhite, GreenWhite, BlueWhite themes in which frames are RGBs with white toolbar, sidebar, popup.

March 3rd 2021.

Sungho.

Version 63.8 was released.

2) Instead, I highlighted button of "FrameWhite" which was larger than others in popup window.

March 3rd 2021.

Sungho.

Hi, 3rdRockGuy.

I have realized your suggestions in FrameWhite version 64.1.

April 12th 2021.

Sungho.