Recent versions of Google Chrome hides icons of installed extensions.

On this screenshot, Amzpecty is installed and active but is not visible from the extensions toolbar.

To show Amzpecty icon, click this icon on the upper right corner of Google Chrome.

A pop-up window will appear.

Click the pin icon like the one shown below beside Amzpecty

to continuously show Amzpecty icon.

Amzpecty icon will now show all the time.