Development question about databases, networks, browser extensions and userscripts

[stax76]

I developed an userscript for Tampermonkey that uses localStorage, the amount of data requires using a database like localStorage.

There is a problem with this app/project, I can only use it on my Linux OS, but I want to use it on my Windows OS too, I cannot use it on both OS because the data isn't shared.

I want to develop something new, the problem with it is that I never did much programming with databases, networks, browser extensions and userscripts.

The data can be stored on a NTSC partition, which can be accessed from all of my OS partitions.

At the moment, I'm clueless and don't even know what to look for, any suggestions welcome.

[stax76]

I did some research and found that I can use a browser extension that can communicate with a database application with native messaging. The database application could use sqlite.

[ChaosKing]

What is the name of the extension? This is something I need too for my next project...

[stax76]

It's an userscript I never released, it's called hd-source, I use 5 minutes every day.

[stax76]

My project hides content that would otherwise be shown again and again. What is your project about?

Before I start, I go through a JavaScript tutorial, this one is really excellent:

https://www.javascripttutorial.net