Panic Button 4.3 beta 2

What's New:
• Panic Button can now restore multiple browser windows that were hidden by the Hide and Replace action (issue #44). Note that browser tabs loaded with special Firefox pages, such as the Firefox options page and Add-ons Manager, cannot be restored
• New action to minimize the current browser window (issue #47)
• The default keyboard shortcut is changed to F8 to avoid a conflict with toggling Reader Mode on Windows 10 (issue #49)
• Improvements to Dark Mode icons
• [Fixed in 4.3b2] Post-upgrade page doesn't load (issue #55)

Things You Should Know About:
• Panic Button 4.3 requires Firefox 78 or newer.
• Panic Button won't work if Firefox is set to "Never remember history" in Privacy & Security settings.