Facebook Profile Picture Viewer Url =link= ★ Certified
In the new tab, look at the URL. Sometimes, Facebook appends parameters to the end of the URL that limit the image size (e.g., &oh=...&oe=... ). Try removing everything after the .jpg or .png extension and see if it loads a larger version. Note that this doesn't always work as some parameters are necessary for the image to load.
The internet is full of "hacks," but the "Facebook Profile Picture Viewer URL" is a relic of the past. Modern Facebook security ensures that private profiles stay private. Don't fall for scams that promise otherwise—protect your data, avoid shady websites, and respect the privacy settings of others.