Yes—they can.
If you’re noticing slowness, trouble loading data, or features not working correctly in BigContacts, your browser extensions or plugins might be the cause. These small tools can interfere with how your browser connects to web apps like ours—especially if they block pop-ups, cookies, or scripts.
Let’s walk you through how to test this and fix it.
Start by disabling all browser extensions, then try using BigContacts again. If everything runs smoothly, you’ve found the cause. You can then re-enable extensions one at a time to figure out which one is causing the issue.

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While we recommend using a more modern browser, here’s how to disable add-ons in IE:
Some extensions—especially ad blockers, antivirus toolbars, or script managers—can block essential parts of BigContacts from working properly. These may:
Testing without extensions gives you a clean, accurate view of how BigContacts is performing.
Try accessing BigContacts in a private/incognito window with no extensions, or use a fresh browser like Firefox. If things work there, you’ll know your original browser setup is the problem.
Need help identifying a specific extension? Email us at support@bigcontacts.com and we’ll help you troubleshoot.