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Fixes #212
Findings:
When the DevTools is closed and reopened, the content script containing the highlighter is reloaded
=> the value of _hightlighter global var is overwritten
=> the code in the setDimension function that accesses the _hightlighter by closure cannot find the reference anymore
Solution:
Made the highlighter Singleton and defined _hightlighter as a private field of its single object, to allow referencing it by this._highlighter, rather than closure