Extension No Longer Supported? 7 Best MV3 Replacements (2026)

“This extension was turned off because it is no longer supported” means Chrome disabled a Manifest V2 extension. Chrome 138 stopped running MV2 code in July 2025, Chrome 151 deleted the last override on July 28, 2026, and reinstalling changes nothing. The fix is a Manifest V3 replacement: seven verified ones below, matched by category.

Key takeaways

• The message is a death certificate, not a glitch. No toggle, reinstall, or flag brings a Manifest V2 extension back on Chrome 151.
• Every replacement below was checked as live and installable in August 2026, with current version and user counts where the store shows them.
• August 31, 2026 is the store purge date. Your browser won’t change that day, but the old listings vanish — match your dead extension to a replacement before its page 404s.

Match the Dead Extension to Its Replacement

Find the row that matches what Chrome turned off. Details on each pick follow.

One thing before the picks: check chrome://extensions and read the exact warning text under the dimmed card. “No longer supported” is the MV2 message. Grey cards citing policy, corruption, or sideloading have different fixes, covered in our MV2 identification guide.

Ad Blockers: Three Ways to Replace uBlock Origin

The most common casualty by far. Full uBlock Origin is Manifest V2 and has been dead on stable Chrome since version 138 shipped in July 2025, more than a year before this article’s August 2026 publication. If your grey card is uBO, you have three live options.

uBlock Origin Lite (~16 million users) is Raymond Hill’s own MV3 successor. It runs fully declaratively, needs no permanent background process, and handles cosmetic filtering despite the persistent myth that it can’t. The trade-off against old uBO is depth: MV3 caps rule counts and dynamic filtering, so element-picker power workflows lose some reach.

AdGuard AdBlocker (~16 million users, 4.7 stars) is the other heavyweight. Its MV3 build layers a dynamic “Quick Fixes” system on top of Chrome’s declarativeNetRequest engine, which lets it patch broken filters between extension updates.

SuperchargePerformance (v1.4.6) takes a different angle: 195K+ blocking rules, evaluated natively by Chrome’s DNR engine, bundled with the tab suspension covered next. If the MV2 shutdown killed both your ad blocker and your tab suspender, it replaces the pair with one extension. Dedicated blockers go deeper on cosmetic and dynamic filtering; the bundle wins on covering two dead extensions at once, with zero telemetry and no account.

And the fear that MV3 blockers barely work? A PoPETs 2026 study tested four popular blockers against their MV3 versions and found no statistically significant drop in overall blocking effectiveness.

Tab Suspenders: What Replaces The Great Suspender

This category died twice. The Great Suspender was removed from the Chrome Web Store back in February 2021 after malicious code surfaced under a new owner, and most of the MV2 forks that filled the gap were disabled at Chrome 138.

Two survivors are worth installing today. The Marvellous Suspender, the clean community fork, completed its MV3 migration and sits at v9.0.1 as of August 5, 2026. It stays faithful to the original: suspend tabs, restore on click, minimal extras.

SuperchargePerformance rebuilds the idea on Chrome’s own chrome.tabs.discard() API, which frees the discarded tab’s renderer process — that’s 90-95% of what the tab was holding, per tab. Where it moves past the classic suspender is protection: 29 auto-protected web apps (Gmail, Figma, Notion, Slack and the rest never get suspended mid-work), plus audio, pinned-tab, and unsaved-form detection. Suspension timers run 5 minutes on the default tier, 15 minutes on the lighter Low tier, custom timing on PRO.

Session Managers: Update, Don’t Replace

If the dead card is an old session or tab manager, check whether the developer shipped a rebuild before hunting alternatives. Session Buddy is the instructive case: its v3 relied on WebSQL, a deprecated browser API, forcing a full MV3 rewrite. The current v4.1.2 (updated April 28, 2026, 1 million users, 4.7 stars) is alive and maintained, so a stale v3 install needs an update, not a funeral.

Approaching the same need from the workspace side, SuperchargeNavigation (v1.3.4) keeps named workspaces and 50 automatic snapshots taken at 5-minute intervals. If what you used your session manager for was “restore everything after a crash,” that snapshot ring covers it while adding a tab sidebar and an Alt+K quick-search you didn’t have before.

Userscripts and Volume Boosters

Tampermonkey made the MV3 jump at version 5.0 and shipped its latest stable release in May 2026, so if your userscript manager went grey, you were likely on the frozen Legacy (MV2) listing. Install the current version, then flip on Developer mode at the top right of chrome://extensions — Chrome requires it for userscript injection under MV3, and scripts silently refuse to run without it.

Volume boosters were hit harder. The category was full of set-and-forget MV2 extensions whose developers had moved on years before the shutdown. SuperchargeAudio (v1.0.5) is an MV3-native replacement that goes past the old single-slider tools: boost up to 600%, a 10-band equalizer, and per-site profiles that remember settings for each domain. No account, and audio processing stays on your machine.

Why the Old Extension Won’t Come Back

The shutdown finished in stages, which is why the message feels sudden even though the platform change wasn’t. Chrome 138 disabled MV2 extensions for regular users on July 24, 2025. Enterprise policies and developer flags kept narrow escape routes open for another year. Chrome 151, stable since July 28, 2026, deleted all of it, including the enterprise policy path.

That leaves August 31, 2026, a date Google officially confirmed on July 8, 2026: every remaining MV2 listing gets deleted from the Chrome Web Store. To be precise about what that changes, nothing stops working that day. The extensions already stopped. What disappears is the paper trail — listing pages, feature descriptions, the ability to check what that greyed-out extension even did. If you’re reading this before the purge, open your dead extension’s store page now and note its feature list. It makes finding the right replacement a two-minute job instead of guesswork.

If Your Card Is Grey Today

• If it was an ad blocker: install uBlock Origin Lite or AdGuard AdBlocker now. Both are free, and an unprotected browser is the worse interim state.
• If it was a tab suspender, or the shutdown took your blocker and suspender together: SuperchargePerformance covers both in one MV3-native install.
• If it was a session manager: check the developer’s listing for a v4-style rebuild before switching tools. Session Buddy shipped one.
• If it was Tampermonkey: update to 5.x and enable Developer mode, or your scripts stay dead even though the extension runs.
• If you’re not sure what the grey card even was: identify it with the warning-text table here before August 31, while its store page still exists.