Chrome Customization: Ctlr+Tab to switch to last Tab

I was struggling to switch between two Tabs in Chrome, having opened many.

I share here my final solution.

Monitor web content

Frequently I want to watch a webpage i.e. be notified when a web page is updated.
Common use cases for example: get a notification when a software is updated (watch the changelog), be notified when a question (I haven't asked myself but I'm interested in its answer) in StackOverflow is updated, dedicatedly watch a page in HCL Connections (out of my overcluttered notifications feed), subscribe to a github commit feed etc.

I present here the best solutions I have found so far for this.