Rated 4 out of 5 stars

For some reason, pinned tabs seem to reload instantly after "unloading" them.

This review is for a previous version of the add-on (1.5).  This user has a previous review of this add-on.

browser.sessionstore.restore_pinned_tabs_on_demand

"browser.sessionstore.restore_pinned_tabs_on_demand" is your friend in about:config.

Please see detailed instructions on https://support.mozilla.org/en-US/questions/940656#answer-377837

By the way, I'm planning to add a checkbox in options for this pref.