Contribution to LibreJS - Backup and Restore Feature

[Mónica Gómez]

Dear Bug-librejs email list,

I hope this email finds you well. My name is Mónica Gómez, and I have 
recently added a new feature to LibreJS that I believe could be a 
valuable addition to the project. The feature allows users to create and 
restore backups of their whitelisted and blacklisted sites, enabling 
them to maintain their settings when using a different computer or 
switching web browsers (e.g., from Firefox to IceCat).

I made 10 tests and none of them had any errors, and also tested the 
extension using it with the new changes in my web browser and everything 
worked correctly and no other functionality was affected. The mechanism 
is the following: it creates a JSON file with the values of 
`pref_whitelist` and `pref_blacklist` and lets the user download the 
file in their computer. Upon restoring the same JSON file, the extension 
reads the saved values and updates LibreJS' localstorage accordingly, 
overwriting any previous data. Additionally, the page is updated to 
ensure users can immediately see the changes.

To align with the LibreJS development process, I referred to the 
official manual available on gnu.org for the "Building" and "Releasing a 
new version" sections. I have already made and signed the commit. 
However, I am currently facing challenges in pushing the changes to 
Savannah or making a pull request, as I have never used such website and 
I understand it works differently from other git hosting platforms like 
GitHub or Codeberg.

I am enthusiastic about contributing to the project, and I would greatly 
appreciate your guidance on the Savannah process and the rest of the 
packaging and release steps. If you find my contribution valuable, 
please let me know, and I would be happy to proceed as needed.


Best regards,

Mónica Gómez

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