Started seeing this early this week (6/3 or so). STR: Click on link in GMail Expected: "Tab saved to Nightly" toast shows tab was sent to Nightly Actual: Chrome usage and terms opens up My guess is that maybe GMail has changed its Custom Tabs usage, and Nightly doesn't fully support it (mcomella said he didn't see this behavior when Firefox Beta is the primary browser). It's possible to use Nightly's tabqueues if you long-press the GMail link and select "Open in Browser".

For the record, I see the custom tabs setting in my Nightly settings, but it's not turned on.

In my case I don't see the "Tab saved to nightly" toast either, but it pops up a custom tab that says "powered by Nightly" in the menu. (I prefer the toast)

Re-triaging per https://bugzilla.mozilla.org/show_bug.cgi?id=1473195 Needinfo :susheel if you think this bug should be re-triaged.

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