PDFs open in a new window, and the tab can't be put in an existing window
When I open a PDF from a file in Firefox, the file appears in a new browser window. When I try to click and drag the tab to another window, it just drags the PDF tab out of the window it was in and creates a new window, so the PDF tab won't go with the windows that already existed before the PDF was opened. The new window doesn't seem to have the same extensions I have installed on the other window, but it is also not an Private Window because that icon doesn't appear in the top right like it normally does. I am also signed into the same account on both windows.
Alla svar (1)
External links open in the default profile, you can see which profile is default and change it by visiting about:profiles in the address bar.