Thank you for your review. You may also toggle on/off PhotoShow easily for the site you're browsing via hotkey (Alt+P by default). For customizing the hotkey, find "Manage Extension Shortcuts" on about:addons.

EDIT - October 19th, 2024
With the release of update 4.45, you now have an additional option to temporarily suspend PhotoShow while browsing. Simply hold the new 'X' hotkey, and no popups will appear. Enjoy!