about:addons says that NoScript was last updated on Jan 1, 2000 ⇒ user confusion
The Tails Help Desk told us (https://redmine.tails.boum.org/code/issues/16762) that two users reported concerns after seeing in about:addons that NoScript was last updated on 2000-01-01. I can only assume that more users are concerned/confused too but did not bother reporting it.
I guess this happens right now because the NoScript icon was recently hidden, combined with the recent armagadd-on bug that disabled NoScript: I think these two factors explain why concerned users go double-check in about:addons whether NoScript is really enabled, and then notice this weird date. I'm pretty sure that after a few weeks or months, users will regain their trust in "NoScript is up-to-date and enabled in Tails" and will stop bothering, which will make this entire ticket moot.
Still, if it's trivial to expose a more correct looking date in the UI, maybe it's worth the effort?