Treat mobile Firefox as mobile Safari on iOS

[philiprenich]

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Not quite sure if this should be a feature request or a bug report.

Firefox on iOS does not handle text fields and viewport scaling correctly. This makes for a really awkward and frustrating experience when editing input fields where the viewport zoom keeps jumping.

On iOS, Firefox is not given the value maximum-scale=1.0 to the "viewport" meta tag. Adding this would fix it.

Describe the solution you'd like

Add a new UA string constant to the Request.php to capture iOS Firefox or modify the existing Mobile Safari regex to include Firefox.

server/lib/private/AppFramework/Http/Request.php

Line 43 in ee43b68

public const USER_AGENT_SAFARI_MOBILE = '/^Mozilla\/5\.0 \([^)]+\) AppleWebKit\/[0-9.]+ \(KHTML, like Gecko\) Version\/[0-9.]+ (Mobile\/[0-9.A-Z]+) Safari\/[0-9.A-Z]+$/';

Describe alternatives you've considered
Not sure there is one.

Additional context

Browsers on iOS all are (currently) forced to use Apple's webkit rendering engine so they should all be treated the same.

The comment detailing the reasoning for the maximum-scale toggle states that adding it breaks Chrome and others by disabling user zoom; however, in my testing this does not affect Firefox. This is because on iOS everything is still Safari under the hood.

[philiprenich]

Forgot to note, in case iOS 26 has changed anything, that I (like many people) have refrained from upgrading to Liquid Glass and am still on iOS 18.

When clicking in to a text field on Firefox, the page zooms in slightly (notice there is no margin around the text field).

When removing focus from the field, the page zooms in to an unusable state.

[philiprenich]

I'd also like to mention that this feels like a really good "first issue" for new contributors (like me!), and I'm happy to submit a PR as long as their is an informed decision on the best way to solve it (ie, new constant or altered regex).

[provokateurin]

Add a new UA string constant to the Request.php to capture iOS Firefox or modify the existing Mobile Safari regex to include Firefox.

Adding a new one is probably easier to handle. Can you also check if other browsers are affected and need similar exceptions?

Browsers on iOS all are (currently) forced to use Apple's webkit rendering engine so they should all be treated the same.

I worry a bit what will happen if one of the browsers switches away from webkit, but I guess we just need to wait for that to happen and then check if it breaks or not.

I'd also like to mention that this feels like a really good "first issue" for new contributors (like me!), and I'm happy to submit a PR as long as their is an informed decision on the best way to solve it (ie, new constant or altered regex).

I added the label and assigned you! Feel free to ping me on your PR as well.