Thanks for the review! Happy to hear these issues are resolved. If you notice any more problems feel free to let me know.

Edit: Lmk how v1.3.5 handles. Should be much better.
Edit 2: Just got the firefox update now. All my tabs survived, except 1. Using Wake All Tabs restored the 1 tab that was having issues. Seems this update was focused on tab unloading and new tab sections.
Edit 3: v1.3.6 has a fix for browser restarts/updates. Tab IDs can get changed and there was a mismatch when trying to wake with the sleeping page Wake Up button. While the Wake All Tabs was working correctly and woke them properly. Lmk if this issue is resolved!