A real-world support case, explained in plain English
This case has been de-identified. Customer, staff, device and website details have been removed or generalised.
At first glance, the request looked simple: a website appeared to be blocked.
A staff member at a dental practice was trying to open a supplier’s price catalogue so she could place an order. Every time she clicked a catalogue link, nothing happened. The main catalogue wouldn’t open, and neither would the individual ones. On the computer she used for her admin work, the links seemed to be dead.
In this case, the cause was a browser extension stopping the catalogue windows from opening. Turning off the extension restored access in the browser she used every day.
The Problem
The supplier’s catalogues were PDF files. Clicking a catalogue link was meant to open the document in a new tab or pop-up window. On this computer, that window never appeared.
From the user’s point of view, the link simply didn’t work. That can look like a firewall or web filter blocking the website, which is why it was reported as a block.
What Was Actually Causing It
A browser extension, a small add-on installed in Google Chrome, was interfering with the PDF pop-ups.
Extensions add features such as ad blocking, password saving, PDF tools and privacy protection. Depending on their permissions, they can read or change content on the websites you visit. An extension that misbehaves or applies a rule too broadly can stop a link, download or pop-up from working.
The Clue
The catalogue opened in a Chrome Incognito window. Extensions are off in Incognito by default, unless an individual extension has been allowed to run there.
That pointed us towards the normal Chrome session. It was a useful clue, rather than a diagnosis on its own: Incognito also uses a separate browsing session, so cookies and site data can affect the result.
The cause was confirmed when we disabled the interfering extension and the catalogue opened in the normal Chrome window. A successful private-window test alone wouldn’t have established that.
How We Fixed It
- We connected to the affected computer remotely.
- We opened Chrome’s list of installed extensions.
- We identified the extension interfering with the PDF pop-ups and turned it off.
- We tested the catalogue links again in the normal Chrome window.
- We closed Chrome completely, reopened it and tested once more to check that the fix held.
With that extension turned off, the catalogues opened normally. The staff member could use the supplier’s website without relying on a private window.
Things That Can Change the Fix
The same symptom can have a different cause on another computer:
- Which extension is involved. Ad blockers, pop-up blockers, PDF tools, privacy add-ons and shopping helpers can all change how a website behaves. Check what is installed before assuming which one is responsible.
- Whether the extension is needed. Security tools, password managers and other company-managed extensions may be there for a reason. Ask your IT provider before changing them. A site-specific setting may be more appropriate than disabling the extension.
- Chrome’s own pop-up setting. Chrome can block a pop-up without any extension being involved. For a trusted website that needs one, a site-specific exception may resolve the issue.
- How PDFs are set to open. Chrome can download PDFs instead of displaying them. Check Downloads before concluding that nothing happened.
- The browser or profile. If a link works in Edge but not Chrome, or in one Chrome profile but not another, investigate browser settings, extensions and website compatibility. The comparison helps narrow the cause.
- A wider problem. If it fails in every browser and on other computers, your IT provider may need to check network filtering, connectivity and the website itself.
- The problem returning. Recheck which extensions are enabled and note any recent browser, extension or profile changes.
What You Can Do
If a link or document won’t open on a trusted website, work through these checks. On a work computer, follow your organisation’s IT policies and leave managed or security extensions to your IT provider.
- Try a private window. In Chrome on Windows, press Ctrl + Shift + N. On a Mac, use Command + Shift + N. Open the same page and repeat the task. If it works, an extension or saved browsing data may be involved. Some sites require you to sign in again.
- Check your extensions. Open Chrome’s three-dot menu, then choose Extensions > Manage extensions. If you are allowed to change them, temporarily turn off optional extensions you installed yourself. Retry the link, then turn them back on one at a time, testing after each change. If the problem returns after one is enabled, that extension is a strong suspect. Ask IT about anything unfamiliar or business-managed.
- Look for a blocked pop-up. If Chrome shows a pop-up-blocked icon in the address bar, click it and allow pop-ups and redirects for that trusted site only. Keep the general pop-up protection on. Google’s pop-up instructions show the steps.
- Check Downloads. The PDF may have downloaded without opening. If you want to review Chrome’s PDF behaviour, go to Settings > Privacy and security > Site settings > Additional content settings > PDF documents. Google explains the PDF download and opening options.
- Try another approved browser. If the link opens in Microsoft Edge, tell your IT provider. That helps them focus on differences in browser settings, extensions or compatibility.
- Contact your IT provider. Share the exact link, the affected computer, what happened and which tests worked. If you see a malware, phishing or certificate warning, stop and ask IT rather than bypassing it.
Quick Reference
| What you see | Possible cause | What to try |
|---|---|---|
| Works in a private window, but not normally | An extension or saved browsing data | Test optional extensions or ask IT to investigate the profile |
| A pop-up-blocked icon appears when you click | Chrome’s pop-up blocker | Allow pop-ups for that trusted site only |
| The PDF appears in Downloads | Chrome’s PDF handling setting | Open the file or review the PDF setting with IT |
| Works in Edge, but not Chrome | Browser settings, an extension or compatibility | Compare Chrome’s settings and extensions |
| Fails across browsers and computers | The website, connectivity or network filtering | Contact your IT provider with the test results |
Closing Perspective
A link that looks blocked may be failing inside the browser. When a document opens in one browser session but not another, extensions and browser settings are useful places to start investigating.
Keep extensions to the ones you need, check with IT before changing business tools, and test any fix in the browser you normally use. That helps solve the immediate problem without creating another one.
Need a hand with something similar? Call Osmicro on 1300 412 372 or learn more about our IT support services.