Use script on all tables

I am now completely moving from excel to google spreadsheets. I am writing a set of simple scripts to help me be productive. Is there a way to do this so that these scripts are inherited by all google spreadsheets that I open (new + existing) from my google account? I know I can post the add-on, but it isn't ...

In other words, when I open a new google spreadsheet, I would like my custom menus and functions to be automatically available.

Thank!