When some element changes, the watcher will not eval it again, it cause some problems.
Sorry for my poor English.
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Hi @lanesun!
Thanks for bringing this to our attention, it looks like a regression (potentially from Firefox 69).
The debugger should have a refresh icon in the watch expressions header.
We filed the following bug to track this: https://bugzilla.mozilla.org/show_bug.cgi?id=1612823