Chrome won't let an extension turn on when it needs approval, has damaged files or is blocked by a browser policy. Open Extensions > Manage Extensions and read the message on its card before changing anything.
A permission request can be approved; a corrupted installation needs Repair.
An extension that's permanently unsupported needs a current replacement. If its switch already stays on but nothing happens on a website, check site access instead.
Those are different problems, and repeatedly clicking the switch won't solve all of them.
1. Read the extension's card in the right profile
Open Chrome on your computer. Select the three-dot menu, then Extensions > Manage Extensions. Or enter chrome://extensions as the web address, then press Enter. Find the extension by its name rather than its toolbar icon.
Read the card: look for a disabled switch, a permissions message, a Repair button or a warning about support. Write down the message and use the fix that matches it. You might not need to remove the extension.
Check the profile picture near the address bar, too. Separate Chrome profiles have separate extension lists. If the extension isn't listed, switch to the profile where you installed it before treating this as a broken installation.
Google says to use its extension management controls for switches, corruption repair and access permissions.
Chrome on a phone doesn't provide the desktop extension manager, so these steps apply to a computer.
A missing icon alone doesn't mean the extension is off. Open the puzzle-piece Extensions menu to look for it. Pinning puts the icon on your toolbar; it doesn't repair a disabled extension or give it permission to run.
2. Approve a permission request you recognize
An extension installed alongside a Windows or Mac app can wait for your approval. When Chrome offers Enable, select it only if you recognize the app and want its browser extension. Choose Remove for an unwanted addition.
For an extension added through the phone's Add to Desktop option, the next computer session can also ask for permission. Use Enable extension when that prompt matches the extension you chose.
Read the access request before approving it. Permission to read or change website data lets the extension do more than display a toolbar button.
If the request doesn't fit what you installed it for, leave it disabled and check with its developer.
After approval, return to Manage Extensions. The switch should remain on. Open a website the extension supports and try its normal action.
If the switch immediately turns off again, check the card's new message and continue with repair or policy checks.
I'd keep a note of the warning until the extension works. It gives you something useful to send the developer if approval doesn't stick, rather than just reporting that a button won't work.
3. Use Repair when Chrome reports corruption
On Manage Extensions, find the corrupted extension and select Repair, then confirm Repair extension. Let Chrome finish before testing again. Repair is the option to use when Chrome reports damaged extension files.
Use the control Chrome provides instead of editing the extension's files or loading a copied folder in Developer mode. A copied folder can bring the same damaged files back and won't answer why Chrome rejected the installed copy.
If corruption returns after repair, run an antivirus or anti-malware scan and remove software that's changing Chrome. Suspicious programs can keep changing the extension's files, causing the corruption to return.
Repair the extension again after addressing that software. If the same warning returns, keep its name, version and message for the developer or the Chrome Help Community.
Repeating a repair without dealing with the changing files won't give you a lasting result.
4. Check whether an administrator owns the switch
A computer supplied by an employer or school may block extensions. Open Chrome's three-dot menu and look for Managed by your organization. You can also enter chrome://management to see whether the browser is managed.
Open chrome://policy to view browser policies without changing them. This helps you tell an administrator's restriction from a switch that's simply off. Keep the extension name and the policy information for your IT team.
If the card says an administrator blocked it, ask the administrator to approve that specific extension for your account or device.
Restarting Chrome won't override a policy, and it may still affect your personal profile on a managed computer.
On a personally owned computer with unexpected management, check the installed security software and ask its provider about the policy. Don't delete policy entries at random.
Find out which software set the policy entries and whether the restriction is intentional.
For an installation blocked before it reaches the extension list, the Chrome Web Store block guide explains the separate store-access problem.
A blocked store and a disabled installed extension need different checks.
5. Separate unsupported extensions from site permissions
If the card says the extension is no longer supported, use the replacement option it offers. A missing switch can be part of that retirement.
Older Manifest V2 extensions, built for Chrome's retired extension system, can't run in Chrome 139 or later.
The unsupported-extension guide covers that retirement.
A temporary re-enable option described in outdated advice doesn't mean the option still exists in your current browser.
If the switch stays on, open Details and check its site access. An extension set to run only when selected needs you to select it on the current website. Access to one site doesn't automatically grant access to every other site.
Use On specific sites when the extension only needs particular pages, or choose the access appropriate for its job. Refresh the affected page and test there.
Changing site access won't unlock an administrator-blocked or permanently unsupported extension.
For a failure limited to an Incognito window, open Details and check Allow in incognito. Turn this on if you want the extension to run during private browsing too.
Test a normal window first so this extra permission doesn't confuse the original problem.
If nothing changes, contact the developer through the extension's support details. Include the Chrome version from Help > About Google Chrome, the card's exact message and whether Repair or approval changed it.
Use the Chrome Help Community for repeated browser-level failures.
The Short Version
Read the card, then approve a recognized request, repair damaged files, ask IT about restrictions or replace a retired extension.
When the switch stays on, check the website and Incognito permissions instead.
Checked November 9, 2026.
Isaac Smith is the founder and editor of PC Glance, a website that covers computers, laptops, and technology. He is a tech enthusiast and a computer geek who loves to share his insights and help his readers make smart choices when buying tech gadgets or laptops. He is always curious and updated about the latest tech trends.