- Use cookies from browser pane when running detectWeb or doWeb
- Use cookies from document when running or updating tests
This should fix various cases where translators can't be properly
developed or tested in Scaffold (e.g., [1]).
[1] https://github.com/zotero/translators/pull/2296#issuecomment-739116620
`nsIFilePicker::show()` is removed in Firefox 60 in favor of `open()`,
which takes a callback (and apparently has been preferred for a long
time).
There's no point switching to that, so this module is a version of
nsIFilePicker with an async `show()` that returns a promise and some
XPCOM-isms replaced (e.g., string paths instead of nsIFile).
