Component backlight does not work

I can't install the tools

memory leak.

completely useless

The add-on doesn't work on websites which specify a Content Security Policy. There's been a bug about that open on GitHub since February 2020 (#17997), yet nobody cares enough to fix it. The project I'm working on specifies a CSP, so this tool is useless for me.

Unusable due to https://github.com/facebook/react/issues/22034

doesn't work for this website under firefox, funny.

in macOS, Usage of CPU is too HIGH and memory leak

57.0.1 (64-bit)
Can't install because I need at least version 54 of Firefox.

I want to like this one because its needed in React development! I think it has a memory leak or something it was using 10Gb of ram! i thought my computer was going to catch fire! haha Maybe i am doing something wrong. Firefox version: 56.0.2, OSX Sierra 10.12.6