Useful addition Rated 4 out of 5 stars
Tested on Mac OSX 10.4, Firefox 18.104.22.168
No errors found in chrome using Console2. No apparent security or privacy issues detected.
Works as advertised on characters I tried, although could not get the extension to encode html strings eg change & to amp (maybe not supposed to do that per se??). Would second other reviews about a slightly unusual UI. Would recommend developer passes the 'centerscreen' flag in the open dialog function.
Would be happy to see this released as is, but would benefit from SLIGHT tweaking as described above.