Field guide · N°01

Master Ad-Blocking, Speed Optimization & Privacy on Android

This guide walks you through configuring Via Browser's ad-blocking engine, tuning WebView's rendering flags, and locking down privacy settings — no root access and no developer background required. Work through the six parts in order, or open whichever section you need.

Note Menu labels may shift slightly between Via Browser versions — if a setting isn't where this guide says, check nearby menus first.

Redmi 12+ Android 15 100/100 Adblock Score

via://adblock-engine LIVE

Trackers blocked / page 0

Ad-block score 0/100

Illustrative read-out of a tuned setup — your numbers will vary.

0% Setup progress Open a part below to begin

10–15 min setup No technical knowledge required Mid-range optimized

A clean, ad-free browsing experience across news sites, blogs, and forums.
Fewer trackers following you between sites, with analytics and ad-network scripts blocked before they run.
Faster page loads, since the browser skips fetching and rendering blocked resources.
Lower data usage — useful if you're on a limited mobile plan.
A 100/100 result on standard synthetic ad-block score tests.
A repeatable setup you can reapply after a factory reset or on a second device in about 10–15 minutes.

An Android phone running Android 15 (this guide is written and tested on a Redmi 12+, but the steps apply broadly to most Android devices).
Via Browser installed from the Play Store, updated to the latest version.
A Wi-Fi or mobile data connection to download filter lists (they're small — usually a few megabytes combined).
10–15 minutes of uninterrupted time.
No root access, no ADB, and no coding required — every step here uses Via Browser's own settings menu.

The setup

Six parts, in order

Via Browser ships with a built-in ad-blocking engine that works off filter lists — plain-text rule files the same format used by EasyList-compatible blockers. Turning it on and pointing it at a few well-maintained lists is most of the work.

1.1

Turn on the built-in blocker

Open the Via menu and go to Settings → Ad Block, then switch on Enable Ad Block. This activates the engine but doesn't add any rules yet — that's the next step.

1.2

Add the core filter lists

Still inside Settings → Ad Block, choose Subscribe by URL and add each list below one at a time. Via downloads and parses each list automatically.

1.3

Set the update frequency

Under Settings → Ad Block → Update Interval, set it to Daily so new rules (and fixes for broken sites) arrive automatically without you doing anything.

1.4

Verify the lists loaded

Back in Filter Lists, each entry should show a green check and a rule count next to it. A grey or red entry means the download failed — re-add that URL or check your connection.

Add each list individually below, or

Filter List	Purpose	URL	Priority
EasyList	Core ad-blocking rules used by most ad blockers	easylist.to/easylist/easylist.txt	Required
EasyPrivacy	Blocks tracking scripts and analytics beacons	easylist.to/easylist/easyprivacy.txt	Required
Fanboy's Annoyance List	Removes cookie notices, pop-ups, and social widgets	easylist.to/easylist/fanboy-annoyance.txt	Recommended
Peter Lowe's Ad Server List	Host-level blocking for known ad and tracking domains	pgl.yoyo.org/adservers/…	Optional

Add EasyList and EasyPrivacy first — they cover the vast majority of ads and trackers on their own.

Via Browser runs on Android's system WebView, which exposes an experimental flags page (similar to chrome://flags on desktop Chrome). A handful of these flags noticeably improve scrolling smoothness, network speed, and image loading on mid-range hardware.

Open Via's menu, look for Kernel or Flags in settings — on devices where it isn't exposed there, you can reach the same page through Android's WebView DevTools app (Settings → System → Developer options → WebView DevTools → Flags). Search each flag name below and set it to the recommended value.

Flag	What it does	Recommended
enable-quic	Uses the QUIC transport protocol for faster, more resilient connections	Enabled
enable-parallel-downloading	Splits downloads into parallel requests to finish faster	Enabled
smooth-scrolling	Animates scrolling instead of jumping between frames	Enabled
enable-back-forward-cache	Keeps recent pages in memory for instant back/forward navigation	Enabled
enable-lazy-image-loading	Defers offscreen images until you scroll near them	Enabled
enable-lazy-frame-loading	Same as above, applied to embedded iframes (ads, widgets)	Enabled

Flag names and availability can differ slightly across WebView versions. If one isn't listed, search by keyword in the flags search box.

After changing flags, fully close and reopen Via Browser (swipe it away from Recents) so the changes take effect.

Ad blocking stops ads. These settings, all under Settings → Privacy, stop the data collection that funds them. Check each one off as you apply it.

Turn off "Save passwords"Stops the browser from storing login credentials on the device.

Block third-party cookiesPrevents ad networks from tracking you as you move between sites.

Enable the "Do Not Track" request headerSignals sites not to track you — advisory, and not every site honors it.

Clear browsing data on exitWipes history, cache, and cookies every time you close the browser.

Turn off usage statistics / ad personalizationStops the browser from sending anonymized usage data back to its developer.

Disable location access for the browserSites can no longer request your GPS position by default.

Set a Private DNS provider (Android system setting)Routes DNS lookups through an encrypted resolver instead of your carrier's default.

Before you call it done, confirm the setup actually works — and that it hasn't broken anything you rely on.

Open a heavy, ad-supported site (a news homepage works well) and confirm no banner or video ads appear.
Run a synthetic ad-block score test to confirm the engine is actively catching known ad slots.
Compare page-load feel before and after — most sites should visibly finish rendering sooner with fewer resources fetched.
Open everyday sites you actually use — email, banking, shopping — and confirm they still work normally. If something's broken, see Part 5.

EasyList Active Trackers Blocked Privacy Settings Applied Flags Configured

Average page load −55%

Before

4.2s

After

1.9s

Data used per page −61%

Before

2.8 MB

After

1.1 MB

Ads/trackers blocked per page +35/page

Before

After

~35

Ad-block test score +100 pts

Before

0/100

After

100/100

Example results from a typical ad-heavy news site. Your numbers will vary by site, device, and connection.

Check off any issue you're seeing, then apply the fix next to it.

A site looks broken or a button doesn't respondAdd the site to your allowlist (Settings → Ad Block → Allowed Sites) and reload the page.

Ads are still showingForce-update your filter lists (Settings → Ad Block → Update Now), then fully restart the browser.

Videos won't playTemporarily allowlist the site — some video players load through the same scripts an annoyance list blocks.

A filter list shows "0 rules" or a red markCheck your connection and re-add the URL — a firewall or VPN may be blocking the download.

Pages feel slower, not fasterRemove filter lists you don't need — each additional list adds parsing overhead on every page.

A login or checkout page won't submitThird-party cookie blocking can interfere with payment providers — allow cookies for that one site only.

A good ad-block setup degrades slowly as sites change and lists go stale. A few minutes on this schedule keeps it working.

Weekly

Update filter lists manually if auto-update is off

Clear cache and browsing data

Monthly

Check the Play Store for a Via Browser update

Review your allowlist and remove sites you no longer need excepted

Confirm your WebView flags from Part 2 are still set — updates can reset some of them

Quarterly

Re-run the ad-block score test to confirm nothing has regressed

Review privacy settings against Part 3's checklist

Back up bookmarks and settings before major Android updates

Outcomes

Results You Can Expect

Faster Browsing

Pages load without waiting on ad and tracker requests that never fire.

Less Data Used

Fewer resources downloaded per page — noticeable on limited mobile plans.

Better Battery Life

Less script execution per page means less CPU work overall.

Fewer Trackers

Analytics and ad-network scripts are blocked before they ever run.

Cleaner Layout

No banners, pop-ups, or auto-playing video ads competing for space.

Consistent Scores

A 100/100 result on standard synthetic ad-block tests.

Reference

Final Configuration Summary

A quick reference for everything this guide sets up — useful when reapplying the setup on a new device.

Filter Lists

Name	URL	Status
EasyList	easylist.to/easylist/easylist.txt	Active
EasyPrivacy	easylist.to/easylist/easyprivacy.txt	Active
Fanboy's Annoyance List	easylist.to/easylist/fanboy-annoyance.txt	Active
Peter Lowe's Ad Server List	pgl.yoyo.org/adservers/…	Active

Privacy Settings

Setting	Value
Save passwords	Off
Third-party cookies	Blocked
Do Not Track	On
Clear data on exit	On
Ad personalization	Off
Location access	Off
Private DNS	Enabled

Master Ad-Blocking, Speed Optimization & Privacy on Android

Start here What You'll Achieve

Before you begin Prerequisites

Six parts, in order

01 Part 01 Filter Configuration 4 lists

Turn on the built-in blocker

Add the core filter lists

Set the update frequency

Verify the lists loaded

02 Part 02 WebView DevTools Optimization 6 flags

Part 03 Via Browser Privacy Settings 0/7 applied

Part 04 Testing & Verification 4 checks

Part 05 Troubleshooting 0/6 resolved

Part 06 Maintenance Schedule 0/8 done

Weekly

Monthly

Quarterly

Faster Browsing

Less Data Used

Better Battery Life

Fewer Trackers

Cleaner Layout

Consistent Scores

Filter Lists

Privacy Settings