No, AFAIK all Mozilla GRE based browsers have it - it is only very accessible here.
With FFox or SMonk You would probably have to set it by hand in prefs.js or user.js.
I do not know whether the Japanese MFC embed browsers (e. g. Bagel) offer it
(i do not read that language), but You cam also set by hand like above.
Opera used to have the feature, or still has it - but keeps Opera in strin
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