Rated 5 out of 5 stars

A small request: can you let PinTabAlt honor the preference "Don't load tabs until selected"?
Right now, pinned tabs are always loaded, which is not the case without the addon. The relevant about:config preference is "browser.sessionstore.restore_pinned_tabs_on_demand". Thanks!

Rated 5 out of 5 stars

Seems to work so far! Thanks.
By the way, you might want to consider changing the addon's name to aid discoverability -- just by the name I wasn't sure what it did (Alt+Tab?!), until I read the description :) Permanent Pinned Tabs would be a simple choice.