Hello mdsfromtrail,
Thank you for using Apple Support Communities. It's my understanding you're unable to enlarge photos in Facebook on your Macbook Air. Being able to enlarge photos can surely add to the Facebook experience. I am happy to help you.
Does this only occur on the Facebook site or all sites in Safari? In some cases these types of issues can be caused by Safari Extension and other Internet plug-ins. I recommend turning off Safari Extensions using the instructions.
You can turn off Safari Extensions to learn whether any are causing the issue.
- From the Safari menu, choose Preferences.
- Click the Extensions icon, then select an extension from the list.
- Deselect the Enable checkbox to turn off that extension.
If turning off an extension resolves the issue, check for extension updates by clicking Updates in the lower-left corner of the window. Or remove the extension by clicking the Uninstall button.
If Safari is slow, stops responding, quits unexpectedly, or has other issues
Have a great day!