Chrome vs Firefox vs Safari for Privacy-First YouTube Tools

Chrome vs Firefox vs Safari: the best browser for YouTube extensions

When a YouTube curation tool falls short, the browser is usually the ceiling. Viewers who sort channels into lists, track watched uploads locally, and build playback queues eventually hit three walls their browser built, not their tool: the permission model it enforces, the background processing it permits, and how easily data stored inside an extension can move somewhere else. A local-first tool can be well designed and still bump into all three.

Yougroup is a useful anchor for the comparison. It is an open-source Chrome extension with no account, no hosted backend, no server-side sync, and no product analytics; lists, watched flags, and queue state live entirely in Chrome extension storage. The tool works. The question is which browser hosts that kind of tool best, and the answer depends on your workflow: scheduled feed refreshes, queue building, and local watched state each stress a different part of the browser.

Here is the scored verdict first, then the constraints behind each score, a five-gate checklist, and a migration playbook for moving a setup between browsers.

Quick verdict: the best browser for YouTube extensions, scored

There is no single winner, only a match between browser constraints and the curation tasks you run daily. Scored on the four capabilities that matter for privacy-first YouTube tools:

Choosing a browser is a match between constraints, not a scoreboard.

Read the table against your own routine, then check the deep-dives for the caveats a one-line verdict hides.

Chrome's Manifest V3 constraints: service workers and the July 2025 cutoff

In Chrome's Manifest V3, extensions can no longer observe and block individual network requests in JavaScript. That is why dynamic, on-the-fly filtering of tracking and ad endpoints is off the table for Chrome extensions.

Short-lived service workers wake on alarms, so background work happens in brief bursts.

Background work changed shape too. MV3 replaces persistent background pages with a short-lived service worker, so a tool that polls YouTube RSS feeds on a schedule cannot keep a script running continuously. It has to wake itself with chrome.alarms and respond to events.

With Chrome 138 all users on all channels of Chrome have now Manifest V2 extensions disabled. Users can no longer turn them back on." uBlock Origin, with over 38 million Chrome Web Store downloads, was among the extensions disabled because it depends on the MV2 blocking webRequest API (BleepingComputer).

For YouTube curation the net effect is specific: no runtime request filtering, and feed work must be event-driven. If your stack needs neither, Chrome's constraints cost you little.

Manifest V3, Chrome vs Firefox: background processing and feed polling

Comparing Chrome vs Firefox extension support under Manifest V3 comes down to how each engine lets a tool do work while you are not looking at it. Chrome's short-lived service worker means scheduled RSS polling must ride on alarms rather than a continuous background script. Firefox's WebExtensions still permit more permissive background page behavior, which makes it the friendlier host for aggressive background feed polling.

Rule ceilings cut the other way. MDN documents MAX_NUMBER_OF_DYNAMIC_RULES as 5,000 in Firefox, versus 30,000 in Chrome (MDN). That number matters less than it looks, because Firefox does not force extensions to rely on declarativeNetRequest at all.

The test for you: does the tool need continuous background work, which favors Firefox, or can it tolerate event-driven wakeups, which Chrome handles fine? A curation extension that fetches feeds on an alarm is Chrome-shaped by design. A tool that wants to observe requests as they happen is not.

Firefox: the last browser where blocking webRequest and MV2 still work

The dynamic filtering model Chrome removed still works in Firefox, and that matters beyond ad blocking: any YouTube tool that needs request-level observation lives on here. The commitment landed just as Chrome was disabling MV2 extensions like uBlock Origin, which sharpened the divergence between the two engines.

There is a portability catch. Firefox's flexibility only helps if your must-have tool ships a Firefox build. Many local-first tools have a Chrome-shaped feature surface; Yougroup's documented install path is to clone, build, and load the unpacked extension in Chrome 114 or later. Firefox wins on permissiveness, but extension availability is a separate axis to check before you commit.

Safari's distribution wall: why open-source tools rarely ship there

Safari's constraints are less about engine capability and more about distribution. Safari extensions ship through a stricter pipeline: App Store signing and review, Xcode builds, and a converter and packaging path for porting extensions written for other browsers.

That pipeline clashes with tools that live as open-source repositories users clone and build themselves. Yougroup's transparency argument rests on anyone being able to inspect the code and load it unpacked with no gatekeeper and no review queue. The App Store path is the opposite arrangement by design.

The result is counterintuitive: the browser often perceived as the most privacy-forward on paper has the thinnest path for local-first, open-source YouTube curation tools. Safari is viable only if your specific tool ships there through the App Store. The distribution model, not the engine, is the deciding factor.

What actually makes privacy browser extensions for YouTube private

The biggest privacy variable in privacy browser extensions for YouTube is the tool's data model; the browser is second. Three tests separate the two:

1. Permission footprint. Yougroup reads YouTube's public RSS feeds "with no YouTube Data API key required; API key is optional for richer details like duration and view counts." Tools that demand broad OAuth or API access instead of minimal host permissions are a red flag on every browser, and worth checking against how to audit a YouTube extension's privacy claims.
2. Storage model. No account, no hosted backend, no server-side sync, no product analytics: data lives entirely in local extension storage, an architecture covered in detail in Building a fully client-side Chrome extension with no backend.
3. Auditability. Open-source code you can clone, build, and inspect yourself is a privacy control in a way that closed, signed-only distribution is not.

Once a tool passes those tests, the browser questions narrow to background behavior and portability. That is a much smaller comparison.

The decision checklist: five gates to pass before you build your stack

Run these in order, because the costliest risks surface first:

1. Export and import must exist. This is a hard gate to check before choosing a browser, not after investing weeks of curation.
2. Background behavior. Can scheduled feed refresh survive service-worker wakeups on Chrome, or does it need Firefox-style background pages?
3. Availability. Does the tool ship for your browser at all: Chrome-native, ported to Firefox, or distributed through Safari's App Store path?
4. Permission footprint. Minimal host permissions and optional API keys, or broad OAuth access?
5. Verifiability. Open-source with an unpacked install, or closed and signed-only?

The order matters because lists, watched flags, and queue state accumulate quietly in local storage long before you discover the walls.

Migration playbook: moving lists, watched state, and queues between browsers

The most actionable warning in this comparison: everything, meaning every list, every watched flag, every saved queue, lives only in browser-local extension storage. Switching browsers after weeks of curation means starting over unless the tool ships export/import.

If you do switch, work in three steps. First, audit what you would lose by listing every list, watched flag, and queue before touching the old browser. Second, export from the old browser's extension storage before uninstalling the tool or wiping the profile; there is no recovery path after that. Third, for open-source tools, use the unpacked path to rebuild the setup in a fresh profile, the same clone, build, and load process anyone can follow in Chrome 114 or later.

If the tool lacks export/import, weigh the rebuild cost against the switch. Sometimes the browser you are already in is the cheapest one to stay in.

Choose the browser first, then build the stack

The verdict logic: Chrome for ecosystem breadth within MV3's limits, Firefox for permissive background work and a surviving MV2, Safari only when your tool ships through the App Store. Yougroup is the concrete case of a privacy-first, local-first tool whose feature surface happens to be Chrome-shaped, which is exactly the compromise readers must weigh rather than resolve in the abstract.

Run the checklist before you invest, and verify export/import before the first list is built, not after.