FF: Provide release notes and version information for updates

[HMK]

(See attached images)

Two issues:

1. The Update available reminder popup has a link to the latest version available to be installed, but it doesn't provide any version information, not what's currently installed and not what version is available to install.
2. The About Firefox dialog box shows the current installed version and a link to release notes for the current version. It also shows an available version to upgrade, but no link to release notes for the new version.  This has been asked for for years, and FF said it was released in 116, but it wasn't.

Look at the third image. See how Thunderbird's About dialog box handles presenting both the existing and available versions as well as providing release notes for both (although consistency in naming would be a better approach. Call them both release notes rather than 'What's new'.)

[Jon]

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[Jon]

Related idea here: Firefox Update prompt with link to release notes