Domain Storage Default Quota
If by any chance things unexpectedly grind to a halt during your usage of webProg3, have a look at the browser's diagnostics. You might see something like this:

Fortunately, the workaround is fairly simple, if you know where to find it!
Type the following into the browser's address box (in a separate tab if you wish) followed by ENTER:

about:config

You will then be presented with the following warning:
Clicking on the blue "Accept the Risk and Continue" button will give you this:
So click on "Show All" to display the list of preferences, and scroll the page down to find "dom.storage.default_quota":
As you can see, the default number of bytes for WebStorage is very small! Increase this by clicking on the "Edit" button on the right-hand side, and typing in the value you desire. In this example, I have increased it to 100000 bytes, but it could be more if you wish. However, I have no idea what the upper limit is.
That's it! Close the tab and carry on where you left off.