I tried reproducing the issue on Firefox 64.0b3, 64.0b5, 65.0b5 and 65.b011 under Ubuntu 18.04 (x64) and Linux Mint 19.1 (x64), but without success. I tried under normal circumstances with clean profiles and safe mode, everytime the browser behaving correctly, without any kind of freezes.
Bug 1517101 Comment 40 Edit History
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I tried reproducing the issue on Firefox 64.0b3, 64.0b5, 65.0b5 and 65.0b11 under Ubuntu 18.04 (x64) and Linux Mint 19.1 (x64), but without success. I tried under normal circumstances with clean profiles and safe mode, everytime the browser behaving correctly, without any kind of freezes.