Its great add-on.
Can we have color customization for highlights? would be good addition here.

GOOD TOOL, HOWEVER CRASHES EVERYTIME...PLEASE FIX

Freezes most of the time but works as intended.

A great start, but it needs to tie in with the search bar (cross-populate the search bar so your searches are synced with highlighting), and more flexible input (whitespace separator and regex in addition to commas, especially if it's going to "sync" with the search bar). And a clear button. Also, don't attempt to highlight whitespaces as valid terms! Please continue work on this extension!

This would be better if it were a fixed, always visible, find toolbar which appears on the bottom of the window-full width, like Firefox once had many years ago. I don't like using Ctrl+F to get the Find Bar to appear, I want that Find Bar to always be present!! With your tool, I have to click the icon each time to change my search word(s), I guess a click is still easier than a Ctrl+F.

I'd like to be able to choose the color for each keyword/phrase

So far, it works. HOWEVER, I'm rating 3 stars due to no option to match precise spelling. For example, trying to search "the" and "they" only highlights "the", or "THE" in THEY - would be nice if that was fixed.

It was great while working in Chrome but I recently switched to working in the new Quantum Firefox and I have to refresh the page every time to get it to work. Not very efficient.

In the search engine search results page, Flip page can not be highlighted, you need to press F5 to highlight and display the contents of the search, I hope the author fixes this problem!

To be practical for the way I can use it, it would need an on/off switch to control highlighting.
Opening mutliple pages at once seems to confuse the add-on that will higlight several times the keywords on the first page.