Delete Firefox installation codebase

Review Request #9832 — Created March 25, 2018 and updated — Latest diff uploaded

ridum
rb-screenshot
master
77a3f89...
rb-extension-pack, students

Since Firefox can install Chrome extensions directly, a seperate code base for Firefox is not required. Therefore I deleted the XPI code;

Try User test on Firefox and Chrome to make sure all features still works after the deletion.

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