Very cool, I have a few problems:
Localization
In my forum we swapped to en_GB locale, so when I mouse over I get:
instead of the alt/flavour text from the component settings:
Can't select text
The plugin seems to steal all cursor mouse-down events and prevents me from selecting any text on the page for copy/paste/quote, etc. This isn’t a problem on meta.discourse…Happy to provide more details about my config/theme (mostly Sam’s simple theme with a few extra components like gallery and gifs) it went away…I love technology.
3.1.0.beta4
Doesn't work in Firefox at all (and some mobile chrome users)
I made an instruction post to use the feature, and some people said they weren’t seeing anything. (not super helpful feedback since I don’t have any real bug reports from people).


