If you’re running 64-bit Windows (<a href="%(version)s">here’s how to check</a>), your Firefox may already be 64-bit. <a href="%(check)s">Check your Firefox version</a> (in the “About Firefox” window) and look for “(32-bit)” or “(64-bit)” after the version number:
Os ydych chi'n rhedeg Windows 64-did (<a href="%(version)s">dyma sut i wirio</a>), efallai bod eich Firefox eisoes yn 64-did. <a href="%(check)s">Gwiriwch eich fersiwn Firefox</a> (yn y ffenestr “Ynghylch Firefox”) a chwiliwch am “(32-did)” neu “(64-did)” ar ôl y fersiwn rhif: