The issues seems to have been fixed as part of Bug 1701690. Considering the space between rows now seems to be large, Bug 1706320 has been filed. Tested using Firefox Nightly 90.0a1 (Build ID: 20210419221626) on Linux Mint 20, Windows 10, macOS 11.1.
Bug 1701688 Comment 4 Edit History
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The issues seems to have been fixed as part of Bug 1701690. Considering the space between rows now seems to be too large, Bug 1706320 has been filed. Tested using Firefox Nightly 90.0a1 (Build ID: 20210419221626) on Linux Mint 20, Windows 10, macOS 11.1.