Add button to favourite current Setup page

[Astisme]

I think it would be great to add a button shortcut to favourite the page the user is on.
The button could be camouflaged as one of the normal ones like these ones

or even better it could show up at the page header after the other buttons (if any)

For solution n. 2, the CSS selector where to put the button is #setupComponent .overflow.uiBlock > div.bRight
and this would be the button
<button aria-live="off" type="button" class="slds-button slds-button--neutral uiButton" aria-label="" data-aura-rendered-by="3:829;a" data-aura-class="uiButton"><span dir="ltr" class=" label bBody" data-aura-rendered-by="6:829;a">Favourite this page</span></button>

Then all the why-salesforce magic can happen by getting the link from window.location.

Do you want me to take a look at this?

[kryvyifedir]

@Astisme wouldn't it make sense to make current "Add" button to pre-populate URL value using current URL when possible?
So the user flow would be something like:

1. Navigate to page that needs to be added as a tab
2. Click on Extension Icon
3. Click "Add"
4. Tab name is automatically saved from current setup page Title, and tab URL from current URL
5. Click Save

FYI @walters954

[kryvyifedir]

Also, "Favorite this page" is a bit misleading. How about "Save as a Tab"?

[Astisme]

On my current implementation, I've removed the Add and the Save buttons so this would not be used.
I agree to change the name of this new button to Save as Tab but it seems like Warren does not check GitHub and I do not want to chase him around.