[Draft] WIP close prompt on download [skip ci]

[vsangereanMOZ]

Relevant Links

Bugzilla: _
TestRail: _

Description of Code / Doc Changes

Made multiple attempts at test.
What I have tried:

• close Firefox by clicking chrome UI elements (window-close-button, close-button, tab-strip)
• close FF by keyboard commands
• close by driver.close()

Nothing seemed to be realiable, since when FF did try to close, I could not get focus back to check the dialogue.

Process Changes Required

Mark the relevant boxes, delete irrelevant lines.

• Adds a dependency (rerun pipenv install)
• Modifies a git hook (rerun ./devsetup.sh)
• Changes the BasePage
• Changes or creates a BOM/POM (name the object model): _
• Changes CI flow
• Changes scheduled Beta or DevEdition
• Changes Git hooks or Github settings
• Changes L10n harness

Screenshots or Explanations

If you need to explain your code, do it here.

Comments or Future Work

Do we need to start another PR soon to address something you saw while working on this?

Workflow Checklist

• Reviewers have been requested.
• Code has been linted and formatted.
• If this is an unblocker, a message has been posted to #dte-automation in Slack.

Thank you!

[vsangereanMOZ]

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