Hi Piet, when you are using Firefox's built-in PDF viewer, the browser's own Find feature is used. So you can call it up using Ctrl+f, or from the menu:

• "3-bar" menu > Find in This Page
• (menu bar) Edit > Find in This Page

Does that work on yours?

Also, regarding Edge, you have some options:

(1) Change your default PDF viewer at the system level to Acrobat, and then set your Firefox options as you prefer:

View PDF files using Firefox’s built-in viewer

(2) If you prefer Edge as your default system level PDF viewer, change how Firefox launches it. This preference switches between a dedicated "app-style" reader and a normal browser tab:

(A) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.

(B) In the search box in the page, type or paste edge and pause while the list is filtered

(C) Double-click the browser.pdf.launchDefaultEdgeAsApp preference to switch the value from true (app style) to false (regular Edge tab)

More info on about:config: Configuration Editor for Firefox.

Hi jscher2000,

Answer 1 does not solved my problem. In this way the search is only on the present page of the pdf but I want to search in the whole document.

Answer 2: I will try but it is more difficult and that takes some time. I let you know in a few days.

Thanks for your coöperation: Piet

Answer 1 does not solved my problem. In this way the search is only on the present page of the pdf but I want to search in the whole document.

Find does not work for text that Firefox has not yet rendered. There are some PDFs that are rendered progressively, that you need to scroll through to render. I don't know what causes that, but file size could be a factor. For big PDFs I recommend using Acrobat.