Scrollbar plugin blocks some browser functions

Yes, windows 7 and firefox are both our of date, but this complaint goes back years to when they weren’t. It’s not only Dewdrop plugin, but every scrollbar-coloring plugin I’ve tried, blocks some browser functions. Notably, it prevents PAGE SEARCH from working. I have chapters online of a book I’m writing. I cannot even find anything on my page while Dewdrop is turned on. Too bad because I really like to have a matching scrollbar. But, it cannot search my page for words I know are there, and I end up having to login to my site and search while logged in. That is the great disappointment of every scrollbar-coloring plugin I have tried, and I have tried a lot of them.