Local background files don't load in Firefox private browsing

[PavelDobCZ23]

Describe the bug
Opening a new tab in private browsing on Firefox doesn't load background images from local files.

To Reproduce

1. Install the extension to Firefox and allow it to run in private browsing
2. Set Background type to Local file
3. Add a few background images
4. Open a new tab inside of private browsing
5. Pay attention to the background

Expected behavior
The backgrounds from local files should load and appear.

Screenshots
Preview of normal browser window:

Preview of private browser window:

Device (please complete the following information):

• OS: Fedora Linux 41
• Browser: Firefox 135.0
• Version: 20.4.2

[victrme]

Hi @PavelDobCZ23,

We're using indexedDB to store our local backgrounds. Because of privacy reasons, normal and private browsing have different databases and cannot communicate...

I'll find a way to have local backgrounds in private browsing, but for now I have no idea 🤔

[PavelDobCZ23]

I've used Tabliss before hopping over to Bonjourr and the developer was able to figure this out, you may wanna take a look at their solution and take some inspiration.

[PavelDobCZ23]

Although it seems they don't use IndexedDB but some other method to store the images.

[victrme]

I'm wondering how he's doing it on Tabliss 🤔

On one hand there is no indexedDB database on the page, on the other hand its storage solution only mentions indexedDB. There might be some React magic.

It might be possible to save the backgrounds on the extension service worker, which can be shared between normal & private browsing !