Random String Generator

This is a simple Random String Generator. The algorism of this extension can be used in the android app[ https://play.google.com/store/apps/details?id=net.aerotrial.demo.randomstringgenerator ]. So, you can generate the same random string from same seed between your pc chrome and android phone. [Update info] v2.1: * add buttons for incrementing/decrimenting the string length v2.0: * UI update * add clipboard copy button * history page of copied strings v1.3: * adapt google chrome extesion manifest v3 * you can set available symbols(default: !@#$%^&*()_+-={}[]?/) v1.2: * Adapt a seed of Japanese charsets * some bug fixes