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Firefox scaling on Retina Macbook vs External 1080P display

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On my Macbook Air M1, Firefox's UI and default scaling is perfect on my Retina display, but if I move the window to my external Philips 1080P monitor, some - but not all - interface elements are very over-sized, which makes Firefox unuseable on any external monitor I connect. (I have tested this with multiple other monitors)

On my Macbook Air M1, Firefox's UI and default scaling is perfect on my Retina display, but if I move the window to my external Philips 1080P monitor, some - but not all - interface elements are very over-sized, which makes Firefox unuseable on any external monitor I connect. (I have tested this with multiple other monitors)
Attached screenshots

All Replies (3)

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Application Basics


Name: Firefox Version: 126.0 Build ID: 20240509170740 Distribution ID: Update Channel: release User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:126.0) Gecko/20100101 Firefox/126.0 OS: Darwin 23.3.0 Darwin Kernel Version 23.3.0: Wed Dec 20 21:30:27 PST 2023; root:xnu-10002.81.5~7/RELEASE_ARM64_T8103 Rosetta Translated: false Multiprocess Windows: 1/1 Fission Windows: 1/1 Enabled by default Remote Processes: 9 Enterprise Policies: Inactive Google Location Service Key: Found Google Safebrowsing Key: Found Mozilla Location Service Key: Found Safe Mode: true Memory Size (RAM): 16.0 GB Disk Space Available: 394 GB

Crash Reports for the Last 3 Days


Firefox Features


Name: Firefox Screenshots Version: 39.0.1 ID: [email protected]

Name: Form Autofill Version: 1.0.1 ID: [email protected]

Name: Picture-In-Picture Version: 1.0.0 ID: [email protected]

Name: Web Compatibility Interventions Version: 125.1.0 ID: [email protected]

Name: WebCompat Reporter Version: 2.1.0 ID: [email protected]

Remote Features


bug-1680034-rollout-shirley-feature-roll-out-81-to-83-release-81-83: active bug-1693420-rollout-sponsored-top-sites-rollout-release-84-100: active bug-1766618-rollout-disable-websocket-over-http2-release-91-100: active bug-1802286-rollout-fix-webcompat-shim-breakage-release-103-107: active rollout-increasing-normandy-skew-out-changes-from-15-m-release-73-75-bug-1616898: active rollout-monitor-v2-1505837: active rollout-restart-manager-release-1481278: active Add an Image to PDF (with Alt Text) - Rollout: (control) CSV Import (Release Rollout): (enable-csv-import) Device Migration Q4 Spotlights Remaining Population: (treatment) Encrypted Client Hello: (rollout) Extensions Migration in Import Wizard - 117+: (control) Highlighting in PDFs - Rollout: (treatment) Mixed content level 2 roll out (Release 115+): (control) MozillaAccounts toolbar button default visibility rollout: (treatment-a) Showing 3rd sponsored tile on the newtab page (Rollout): (control) Relay integration into Firefox Release for all FXA users: (enable-relay-integration) Upgrade Spotlight Rollout: (treatment)

Remote Processes


Type: Isolated Web Content Count: 2

Type: Privileged About Count: 1

Type: Preallocated Count: 3

Type: Socket Count: 1

Type: Extension Count: 1

Type: Utility JavaScript Oracle Count: 1

Add-ons


Name: Add-ons Search Detection Type: extension Version: 2.0.0 Enabled: true ID: [email protected]

Name: Bing Type: extension Version: 1.6 Enabled: true ID: [email protected]

Name: DuckDuckGo Type: extension Version: 1.4 Enabled: true ID: [email protected]

Name: eBay Type: extension Version: 1.4 Enabled: true ID: [email protected]

Name: Google Type: extension Version: 1.4 Enabled: true ID: [email protected]

Name: Wikipedia (en) Type: extension Version: 1.3 Enabled: true ID: [email protected]

Name: System theme — auto Type: theme Version: 1.3 Enabled: true ID: [email protected]

Name: AdBlocker Ultimate Type: extension Version: 3.8.25 Enabled: false ID: [email protected]

Name: Cisco Webex Extension Type: extension Version: 1.20.2 Enabled: false ID: [email protected]

Name: JSONView Type: extension Version: 2.6.1 Enabled: false ID: [email protected]

Name: Stylus Type: extension Version: 1.5.46 Enabled: false ID: {7a7a4a92-a2a0-41d1-9fd7-1e92480d612d}

Name: To Google Translate Type: extension Version: 4.2.0 Enabled: false ID: jid1-93WyvpgvxzGATw@jetpack

Name: Dark Type: theme Version: 1.2 Enabled: false ID: [email protected]

Name: Dreamer – Soft Type: theme Version: 2.1 Enabled: false ID: [email protected]

Name: Firefox Alpenglow Type: theme Version: 1.4 Enabled: false ID: [email protected]

Name: Light Type: theme Version: 1.2 Enabled: false ID: [email protected]

Legacy User Stylesheets


Active: false Stylesheets: No stylesheets found

Graphics


Features Window Device Pixel Ratios: 2 Compositing: WebRender (Software) Font Visibility Debug Info: macOS Platform Asynchronous Pan/Zoom: wheel input enabled; scrollbar drag enabled; keyboard enabled; autoscroll enabled; smooth pinch-zoom enabled WebGL 1 Driver WSI Info: - WebGL 1 Driver Renderer: WebGL is currently disabled. WebGL 1 Driver Version: - WebGL 1 Driver Extensions: - WebGL 1 Extensions: - WebGL 2 Driver WSI Info: - WebGL 2 Driver Renderer: WebGL is currently disabled. WebGL 2 Driver Version: - WebGL 2 Driver Extensions: - WebGL 2 Extensions: - Target Frame Rate: 60 WebGPU Default Adapter: { "navigator.gpu": null } WebGPU Fallback Adapter: { "navigator.gpu": null } GPU #1 Active: Yes Vendor ID: 0x106b RAM: 0

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Diagnostics AzureCanvasBackend: skia AzureContentBackend: skia AzureFallbackCanvasBackend: skia CMSOutputProfile: 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Just as an amendment to the above, the only interface elements correctly scaled on the external display are the window controls.