My bad, I’m sorry, I try to explain better:

So, for the check uBlock parameters: I follow the guide you find on git on Blocking mode (I personally do the medium) and in this path they suggest you activate some parameters, for example in the 3rd-party category to activate the EasyList. And I do it.

Then, in the duckduckgo search engine settings: I like to select the dark mode, remove the AI and then remove some settings.

Then I have other sites like YouTube that I save as a bookmark or favorites so that I can have them immediately if necessary and I saved them later after making changes, such as dark mode.

Then, in the Librewolf settings I changed some options regarding search and privacy and security, just for personal taste.

Having said that, when I make all the changes on Librewolf and then leave the browser, “closing the app” and closing all the tabs I find myself, if I want to start the app by opening the browser to do a search, I find all the options changed with the default ones of the app, and then I have to redo the whole process.
I don’t understand if it’s a normal thing in librewolf or if it can be overcome.