Why did Hover Zoom stop working?

Most cases are one of three things: the extension was disabled or removed by the browser, the site you are on redesigned and the extension's rule for it is out of date, or the extension is no longer maintained and neither problem will be fixed. Testing on a second unrelated site distinguishes the first from the second in about thirty seconds.

Is Hover Zoom safe to use?

The original Hover Zoom was caught collecting and selling browsing data, and security write-ups recommended removing it. Ownership and code have changed since, and the forks are separate projects, but the safest approach is to check what an extension actually does with your browsing rather than rely on the name. An extension that hover-zooms images needs access to the pages you visit, which is exactly the access that made the original incident possible.

Does Hover Zoom work with Manifest V3?

Chrome retired Manifest V2, so any extension not migrated to Manifest V3 stopped running on Chrome and other Chromium browsers. Firefox still runs some V2 extensions, which is why an extension that stopped working on Chrome may keep working on Firefox for a while longer.

Troubleshooting

Hover Zoom not working

Q: What is the difference between Hover Zoom, Hover Zoom Plus, and Hover Free?

They share an origin. The original Hover Zoom was caught logging the URLs of pages its users visited and selling that browsing data, and the community responded by forking it. Hover Zoom Plus and several similarly-named extensions descend from that split. They are separate codebases with separate maintainers and very different levels of ongoing activity, so "Hover Zoom is broken" can mean quite different things depending on which one is installed.

Before troubleshooting, work out which extension you actually have. “Hover Zoom” is several different projects with a shared ancestor and very different maintenance stories, and the fix depends on which one is installed.

Step 1: which one is installed?

Open your extensions page — chrome://extensions or about:addons — and note the exact name and publisher.

The original Hover Zoom was the most popular image-zoom extension on Chrome until it was caught logging the URL of every page its users visited and selling that browsing data. The community forked it, and Hover Zoom Plus along with several similarly-named extensions descend from that split. They are separate codebases with separate maintainers today. The full story is on the blog, and it is worth reading before you reinstall anything with that name on it.

Note the last-updated date on the store listing while you are there. You will need it in step 4.

Step 2: does it fail everywhere, or only on some sites?

Open two unrelated image-heavy sites and hover a thumbnail on each.

One works, one does not — the extension is running and its rule for the broken site is out of date. That is a content problem, fixable only by an update from the maintainer.
Neither works — the extension is not running at all. Continue to step 3.

Step 3: confirm it is running

Enabled? A browser update can disable an extension that no longer meets store policy, quietly. If it shows as removed rather than disabled, it was taken down from the store.
Site access? Chromium browsers let you set an extension to run On click only, which makes it look broken. Set it to run on the sites you use.
Manifest V2? If the extensions page flags it as an older-format extension, this is the Manifest V3 transition. Chrome retired Manifest V2 and unmigrated extensions stopped running; there is no setting that fixes it. Why hover-zoom tools were hit hardest.
Conflicting extension? Content blockers and userscript managers can suppress the overlay. A clean browser profile with only this extension installed answers that quickly.

Step 4: is anyone still maintaining it?

Both of the fixable causes above depend on the maintainer shipping updates, which makes the last-updated date on the store listing the number that decides whether to keep debugging.

Hover-zoom extensions do not die all at once. They degrade one site at a time, and each broken site stays broken. If there has been no release in two or more years, you are maintaining a dead tool.

What to use instead

The workflow you are used to — hover to preview, arrow keys through a gallery, scroll to zoom, theater mode — is well covered by several maintained extensions. The Hover Zoom alternatives roundup goes through each one including the privacy history, and the Hover Zoom Plus comparison covers that fork specifically.

Whatever you install, the question worth asking is the one the original incident raised: a hover-zoom extension needs access to the pages you visit in order to work at all, so what it does with that access matters more than its feature list. Ultra Zoom’s answer is in the zero-knowledge architecture write-up — no analytics endpoint, no remote code, and no server that observes browsing.

Try Ultra Zoom free

Free forever on the majority of supported sites, no account needed to install, and a public release log so the maintenance question stays checkable rather than a promise.