Dunno if this is a bug or a (missing) feature, but i am unable to find in my web archives. When a web archive, PDF, or HTML file is selected, I am unable to cmd-F, and the menu item is ghosted, whether the preview pane has focus or not. I guess this is probably not unique to my copy, so in that case, may I request it as a feature?
Yes, it’s on my to-do list to add a Find panel for the Web and PDF views. In the meantime, of course, you can double-click the file to open it in Safari or Preview and search it that way.
EagleFiler 1.4 adds Find panel support for PDFs and Web views.