The reason this didn't work: #1
There is a successfully working extension which offers same functionality here: https://github.com/hrj/sloth
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Originaly from here: https://sourceforge.net/projects/footab/
This was made avaiable in Chrome web store by Jason here: https://chrome.google.com/webstore/detail/footab/anbodogikfbehidmmjdokehphginagbb
This recently stopped working, so I cloned it here and I'm hoping to fix the issue.