I can reproduce on desktop in Responsive Design Mode, with a 300x600 viewport and this user agent string taken from my phone: ``` Mozilla/5.0 (Android 15; Mobile; rv:136.0) Gecko/136.0 Firefox/136.0 ``` I wasn't able to reproduce when I used a 400x600 viewport, so this might be specific to sufficiently-skinny viewport sizes. Here's a profile (with networking logging enabled in case it's handy, and with 0.1ms-frequency samples), showing several of the reloads: https://share.firefox.dev/4jGbVA3 The marker-chart shows some `CreateAboutBlankDocumentViewer` marks right around each reload point. I haven't yet dug backwards to see what's causing the reload.
Bug 1943898 Comment 2 Edit History
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I can reproduce on desktop in Responsive Design Mode, with a 300x600 viewport and this user agent string taken from my phone: ``` Mozilla/5.0 (Android 15; Mobile; rv:136.0) Gecko/136.0 Firefox/136.0 ``` ~I wasn't able to reproduce when I used a 400x600 viewport~ [EDIT: I can repro with this window size after all; it just needs a manual reload in order to trigger the issue, and I'd overlooked that part.] Here's a profile (with networking logging enabled in case it's handy, and with 0.1ms-frequency samples), showing several of the reloads: https://share.firefox.dev/4jGbVA3 The marker-chart shows some `CreateAboutBlankDocumentViewer` marks right around each reload point. I haven't yet dug backwards to see what's causing the reload.