An option exists to always activate plugins for a site. Please proceed as follows:

• Click the small red building block to the left of the address bar. A menu for activating the blocked plugin opens.
• Click the arrow to the right of the button "Activate All Plugins". A dropdown menu opens.
• Click the item "Always activate plugins for this site" in order to permanently activate the plugin for this site.
• Reload the page to start using the now activated plugin.