1761504 - Extend `setDefaultPDFHandler` Nimbus feature to respect user-changed PDF handlers

Status: RESOLVED FIXED

(Firefox :: Installer, enhancement)

Description

[Nick Alexander :nalexander [he/him]]

This ticket tracks making the setDefaultPDFHandler Nimbus feature added by Bug 1743914 accommodate user-changed PDF handlers, by which we mean PDF handlers that are not other browsers. We're trying to avoid a "split brain" situation where a user wants Firefox as their default browser but ends up back in Edge after opening a PDF. We also want to be "respectful": we want to avoid taking the handler position from user's who've changed from the default handler (Edge), say to Adobe Reader or Nitro PDF. See also https://bugzilla.mozilla.org/show_bug.cgi?id=1743914#c5.

Technically, I expect we'll layer on another Nimbus feature, on by default, to control whether to check for a browser as the existing PDF default handler and to set Firefox as the default PDF handler only that is the case.

Comment 1

[Nick Alexander :nalexander [he/him]]

Attachment: Bug 1761504 - Add `setDefaultPDFHandlerOnlyReplaceBrowsers` Nimbus feature. r?bhearsum

When enabled, this feature restricts the existing
setDefaultPDFHandler Nimbus feature to only set Firefox as the
default PDF handler when the existing handler is a known browser.

Depends on D142147

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/219c9f4056b0
Add `setDefaultPDFHandlerOnlyReplaceBrowsers` Nimbus feature. r=bhearsum

Comment 3

[Cristian Tuns]

https://hg.mozilla.org/mozilla-central/rev/219c9f4056b0