Yea, I think what holds back @kintesh from just replacing storage.local with storage.sync is the migration experience - he doesn't want users to have an automatic update to the extension (as it is happens by default just in the background) and find out that all of their rules just disappeared.

Maybe use both storage.local and storage.sync and have the user choose? Or the much cooler option of having a diff-style editor to merge from local to sync. The editor offers two core benefits; one allows for the user to manage local to sync and deal with any merge conflicts and the other benefit is an editor for container mappings.

I got the idea from uBlock Origins:
uBlock/dyna-rules.html at master · gorhill/uBlock · GitHub
uBlock/dyna-rules.js at master · gorhill/uBlock · GitHub

Now in addition to CSV, rules can be added for mappings and even better, enforced.

CodeMirror: User Manual - Writing CodeMirror Modes

Modes typically consist of a single JavaScript file. This file defines, in the simplest case, a lexer (tokenizer) for your language—a function that takes a character stream as input, advances it past a token, and returns a style for that token. More advanced modes can also handle indentation for the language.

As can be seen here for example:
uBlock/ubo-dynamic-filtering.js at master · gorhill/uBlock · GitHub

CodeMirror.defineMode('ubo-dynamic-filtering', ( ) => {

    const validSwitches = new Set([
        'no-strict-blocking:',
        'no-popups:',
        'no-cosmetic-filtering:',
        'no-remote-fonts:',
        'no-large-media:',
        'no-csp-reports:',
        'no-scripting:',
    ]);
    const validSwitcheStates = new Set([
        'true',
        'false',
    ]);

Wiki page for rule syntax:
Dynamic filtering: rule syntax · gorhill/uBlock Wiki · GitHub

CodeMirror: merge view demo

The merge addon provides an interface for displaying and merging diffs, either two-way or three-way. The left (or center) pane is editable, and the differences with the other pane(s) are optionally shown live as you edit it. In the two-way configuration, there are also options to pad changed sections to align them, and to collapse unchanged stretches of text.

Use firefox sync #30

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