Gecko Drwxr-xr-x ⚡ Ad-Free

The truth is both simpler and more fascinating. This keyword sits at the intersection of , Mozilla Firefox (Gecko browser engine) , and Unix file permissions .

chmod 700 gecko # drwx------ – only owner can access gecko drwxr-xr-x

sudo chmod 755 /path/to/gecko If a gecko cache directory has incorrect permissions (e.g., drwxr--r-- ), Firefox might fail to create necessary lock files. The truth is both simpler and more fascinating

drwxr-xr-x 3 root root 4096 Feb 20 09:42 /usr/lib/firefox/gecko drwxr-xr-x 2 user user 4096 Mar 01 15:22 /home/user/.cache/mozilla/gecko Should you ever change drwxr-xr-x on a gecko directory? In 99% of cases: No . Mozilla Firefox (Gecko browser engine)

org.openqa.selenium.WebDriverException: Unable to read gecko directory permissions