No longer works at manualslib.com. The support site is inaccessible [403 error].

使用的瀏覽器與版本：cyberfox 52.5.1
addons.mozilla.org ：開+關 js 都不能用
www.google.com.tw：開+關 js 都能用
www.google.com.tw/search?q=：開 js 需按很多下才能用，關 js 可用

Used to work great until the last version from April.

Since you don't have a bug report site, I'll drop mine here:
the addon has never worked after April's release, no inputs get focused or cycled.
For an example, test http://webster-dictionary.net. BTW from a quick inspection that site uses iframes.