Great! Rated 4 out of 5 stars

I've had Lightning installed now for a few months on TB3, syncing with four Google calendars with little to no problems at all. The only caveat is that tasks won't sync, but that's not a problem with Lightning, it's because Google doesn't support it yet. Other than that, it's awesome, and I'm perfectly satisfied with it, other than the reminder/alerts.The alerts screens are ridiculously large. I have a screen resolution of 1024 by 768, and though the alert screen fits fine, when the snooze options are opened, the button to click to set the snooze appears off screen. Because of this, I have to move the alert window to the left a little before I can snooze it.There's really no reason for making that window so large.But, that's my only complaint so far.

To Tish: You may have to open it. There should be a tiny button toward the left side of the tab field that looks like a tiny calendar. You can also go to Events and Tasks > Calendar, and it should open in a tab. If the Events and Tasks menu isn't there at the top, it isn't installed correctly, and probably not at all. Check Tools > Add-ons, then click the Extensions button. If you don't see it there, it's not installed.

This review is for a previous version of the add-on (1.0b2).