Why the same website behaves differently by browser
Learn why a website works differently in two browsers, how to compare browser versions and settings, and what to change to fix it.
A website loads in one browser but not another, a button works in one and does nothing in the other, or the page looks different even on the same computer. That does not always mean the website is broken. Browsers can have different versions, permissions, privacy settings, extensions, and support for web features.
Compare what each browser reports before changing settings. The Browser Info tool shows the browser version, engine, permissions, privacy details, codecs, and supported features. It can help narrow down the cause, though it cannot inspect the website's code or identify every site-specific problem.
Compare the browsers
- Open the Browser Info tool in each browser you want to compare. Note the browser version, engine, permissions, privacy information, codecs, and supported features shown.
- Open the same website address in both browsers. Use the same device, network, account, and page, and repeat the exact action that behaves differently.
- Check whether the website needs a feature such as a camera, microphone, location, video playback, or screen sharing. Compare the related permission or supported feature in each browser.
- Reload the page and try again. If the problem persists, note which browser works, which does not, and what each Browser Info report shows.
Keep the first comparison simple. A different account, browser profile, or private window can change cookies and saved sign-in details, so it may not be an equal test.
What the result means
The browsers show different versions or engines
A browser engine is the part that reads a website's code and draws the page. Chrome and Edge use Chromium, Firefox uses Gecko, and Safari uses WebKit. An older version may lack a newer feature or contain a bug that has since been fixed. Even browsers that share an engine can behave differently because their settings and updates are not identical.
Update the browser that behaves incorrectly, then test the page again. If only one engine has the problem after updates, the website may have a compatibility issue with that browser.
One browser lacks a supported feature
Websites may use features for video, audio, graphics, or sharing your screen. If a browser does not support the feature the site expects, the page may hide a control, show an error, or offer a simpler version. A codec is a format used to encode or decode audio and video, so different codec support can affect playback.
Try the same media or feature in an up-to-date browser that supports it. If the feature is missing from one browser, changing a site permission will not add that support.
The permission differs between browsers
Camera, microphone, location, and notification permissions are usually saved separately for each browser. The website may work in one browser because it was allowed there, while the other browser blocks it or has an old permission choice.
Check the site's permission in the browser that fails. If the operating system also asks for access, allow the browser there as well.
The page works in a private window or a clean profile
This points to a browser-specific setting, extension, or saved site data. Content blockers and privacy extensions can stop scripts, sign-in services, or embedded content from loading. A private window may disable some extensions and starts with a different set of cookies, so it is a useful clue but not a perfect comparison.
Turn off extensions one at a time or clear data for that website, then retest. If the issue returns after you restore one extension, that extension is likely involved.
The browsers look different but both work
Websites can adjust their layout for browser size, text scaling, zoom, or the features a browser reports. A small difference in spacing or appearance may be intentional. If a control is missing or an action fails, compare the browser's zoom and accessibility settings too.
How to fix the difference
- Update the browser that fails. Install its latest available update, close and reopen it, and test the site again. On a Mac, Safari updates arrive through macOS updates: open System Settings › General › Software Update.
- Check the site's permissions. Select the site controls icon beside the address bar and review permissions such as camera, microphone, location, and pop-ups. In Chrome, open Settings › Privacy and security › Site settings. In Edge, open Settings › Cookies and site permissions. In Firefox, check Settings › Privacy & Security. In Safari, open Safari › Settings › Websites.
- Check system access for the feature. On Windows 11, open Settings › Privacy & security › Camera or Settings › Privacy & security › Microphone, and allow access for apps as needed. On macOS, open System Settings › Privacy & Security › Camera or System Settings › Privacy & Security › Microphone, then allow your browser. These system settings matter only when the website uses that device.
- Test without extensions. Temporarily disable content blockers, privacy extensions, and script controls, then reload the website. If that fixes it, turn extensions back on one at a time to find which one blocks the page.
- Clear data for that website. Remove the site's cookies and stored data in the browser that fails, then sign in again and retry. This can fix broken or outdated saved data, but it may sign you out or reset that site's preferences.
- Compare zoom and privacy settings. Set both browsers to the same page zoom and temporarily relax a privacy setting only for the affected site. Some privacy protections block third-party cookies or embedded services that a website relies on.
Why browsers can reveal different information
A website can read some details that a browser makes available, including its supported features and certain privacy or permission states. Sites sometimes use those details to choose a layout, enable a control, or show a compatibility message. The browser information sites can access article explains what those details may reveal and what they do not prove.
If the same error remains in an updated browser with extensions off and permissions checked, the website may have a bug or may not support that browser. Share the browser name, version, and the steps that reproduce the problem with the site's support team.
