toolbar button not showing in the toolbar after installation firefox addon

Question

Hi Experts,

I used https://addons.mozilla.org/en-US/developers/tools/builder to build a simple test addon and "checked" Toolbar Button as a "Choose pre-built features"

After installing this addon I am supposed to see a toolbar button in the firefox toolbar right ? Actually it is not happening. Instead if I go through View->Toolbar->customize menu from to, I can see the button there. If I drag it and drop on a toolbar its showing.

I to make it such that the button will automatically appear in the toolbar upon installing.

Thanks in advance. Sourabh