I can reproduce this on Nightly117.01 Linux Mint 21 Cinnamon. Regression window: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=7904cd90621f402e7bfd66e7101372ab45cc8ffd&tochange=52fa6a56b687c22c119bcce966caae5806f50b5a
Bug 1843220 Comment 5 Edit History
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I can reproduce this on Nightly117.01 Linux Mint 21 Cinnamon. Regression window: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=7904cd90621f402e7bfd66e7101372ab45cc8ffd&tochange=52fa6a56b687c22c119bcce966caae5806f50b5a Workaround: Setting browser.tabs.inTitlebar to 0 in about:config. And restart browser.