I have reproduced this issue using Firefox 75.0a1 (2020.02.17) on Windows 10. I can confirm this issue is fixed, I verified using latest Nightly Firefox 123.0a1 on Windows 10, macOS 12 and on Ubuntu 22, Reader view displayed the initial image only once.
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I have reproduced this issue using Firefox 75.0a1 (2020.02.17) on Windows 10. I can confirm this issue is fixed, I verified using latest Nightly Firefox 123.0a1 on Windows 10, macOS 12 and on Ubuntu 22, Reader view displayed the initial image only once. I can still reproduce the issue on Firefox 122.0.
I have reproduced this issue using Firefox 75.0a1 (2020.02.17) on Windows 10. I can confirm this issue is fixed, I verified using latest Nightly Firefox 123.0a1 on Windows 10, macOS 12 and on Ubuntu 22, Reader view displayed the initial image only once. I can still reproduce the issue on Firefox 122.0b9 and on Firefox 122.0.