Bugzilla

We're developing closing synced tabs behind a Nimbus feature variable. It's currently disabled on all channels (including debug builds) by default, but here's the command I use to enable it using `nimbus-cli`:

```fish
nimbus-cli -a fenix -c developer test-feature --manifest ~/Code/gecko/mobile/android/fenix/app/nimbus.fml.yaml remote-tab-management (echo '{"close-tabs-enabled":true}' | psub -f)
```

(This uses [Fish shell](https://fishshell.com/) syntax. `--manifest` is the path to the Fenix feature manifest; `psub -f` performs [process substitution](https://fishshell.com/docs/current/cmds/psub.html) and writes the JSON string to a temporary file, so that `nimbus-cli` can slurp it in).

If you also enable the `identity.fxaccounts.commands.remoteTabManagement.enabled` pref in `about:config` on Desktop (Nightly 127+), Fenix and Desktop will be able to close each others' tabs!

We're developing closing synced tabs behind a Nimbus feature variable. It's currently disabled on all channels (including debug builds) by default, but here's the command I use to enable it using `nimbus-cli`:

```fish
nimbus-cli -a fenix -c developer test-feature --manifest ~/Code/gecko/mobile/android/fenix/app/nimbus.fml.yaml remote-tab-management (echo '{"close-tabs-enabled":true}' | psub -f)
```

(This uses [Fish shell](https://fishshell.com/) syntax. `--manifest` is the path to the Fenix feature manifest; `psub -f` performs [process substitution](https://fishshell.com/docs/current/cmds/psub.html) and writes the JSON string to a temporary file, so that `nimbus-cli test-feature` can slurp it in. There's more documentation about `test-feature` [here](https://experimenter.info/nimbus-cli/working-with-features/#test-feature)).

If you also enable the `identity.fxaccounts.commands.remoteTabManagement.enabled` pref in `about:config` on Desktop (Nightly 127+), Fenix and Desktop will be able to close each others' tabs!