Improvements to avoid Google bot detection

[thaenor]

Browser: Firefox 68.0.1

Leaving the extension running, after a while, it starts to display the "error" label. By checking the logs it is possible to see that all Google's requests are failing. The other search engines seem to be fine

This happens in both stealth and "open" mode. By using the "tab" button and having the extension operate by opening new tabs and running searches in them it is possible to see Google's bot detection acting up

Maybe fiddling with the Average query rate can prevent this. But perhaps there is a way to make the search system harder to detect.