Update UA for Firefox Reality

UA POR for Firefox Reality

FOR 1.0:

• Use default Mobile UA string for 1.0
• GeckoView’s Default (Mobile) UA string is: Mozilla/5.0 (Android 9; Mobile; rv:63.0) Gecko/63.0 Firefox/63.0 (default cannot be changed per GV policy)

For 1.1

Add an override list for key sites to send alternate UA string to:

• If site is in override list, send one of the following two UA strings: – Mobile UA + “VR” String = Mozilla/5.0 (Mobile VR; rv: 63.0) Gecko/63.0 Firefox/63.0 – Desktop UA String = Mozilla/5.0 (VR; rv: 63.0) Gecko/63.0 Firefox/63.0
• Will add UA string tracking field to Content Feed Airtable to track which works best during testing

Additional feature work:

• implement design to allow users to select preferred site (desktop vs. mobile) and save preference
• implement telemetry to collect data about user preferences on per-site rendering preference
• implement ability for GV to request different Viewport sizes with any UA string (whether Desktop or Mobile)
• implement ability for GV to override Viewport size if website does not respect request (edited) (edited)

Related issue:

• https://github.com/MozillaReality/FirefoxReality/issues/455

[bluemarvin]

Switching back to the mobile UA is easiest. To get the VR mobile UA will require some GV work. I assume that means using the mobile viewport with the VR mobile UA. Only desktop UA will not use the mobile viewport.

[larsbergstrom]

Let’s go ahead with just changing the default UA to the mobile one, as @bluemarvin suggested.

@cvan I love these ideas (and basically anything we can do to avoid too much UA sniffing)! I assume that those changes would require some Gecko-side updates, but we should absolutely dig in on them for V1.1.