Refactoring code

[dascritch]

Via e-mail :

A reviewer sent a message regarding the review of version 1.0 of add-on Anchors reveal.

erosman wrote:

Please note the following for the next update:

1. For inserting text, textContent (or JQuery text) or createTextNode() should be used instead of innerHTML.
   eg:
   legends[0].innerHTML = browser.i18n.getMessage('themeParameterDescription');

2. Add-on contains duplicate/hidden/unused/unnecessary files or folders. These complicate the review process and may contain sensitive information about the system you created the XPI on. Such files may also create cause for rejection. Please correct your packaging process so that these files aren't included.
   e.g.:
   lib.js

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