No search performed on a "View Page Source" page.

[second-pair]

Issue Description

• OS: Windows 10
• Browser: Firefox 88.0
  Find+ does not find anything on a "View Page Source" page. It doesn't indicate that 0 (or any other number of) matches were found, indicating it didn't perform the search at all.
  I did a search of your issues for "source", but couldn't find anything similar in the results.

Steps to Reproduce

• Choose a web page and open it in Firefox.
• Open the context menu (right-click) and select "View Page Source".
• Bring up the Find+ search box and attempt to search for something.
  Alternatively, prepending "view-source:" to a URL in the Firefox address bar will take you to the same page.

Screenshots and Documentation

[linparkkin]

I'm having the same issue and it would a very useful feature to add.

[brandon1024]

This is actually something I looked into a few years ago, but browser extensions don't run on these pages (and several others), presumably for security reasons. It's not something I can implement, my hands are tied.