Source listing
Line numbers
Lines can be selected by clicking, optionally with modifier keys. The selected lines are reflected to the URL, and opening URLs with those lines shows the selected lines.
This is handy for sharing a code with pointing specific lines.
Click the line number selects the line.
Shift + click: selects lines by start/end range.
Ctrl + click / Cmd + click: adds/removes individual line from/to the selection.
Blame strip
See the Blame strip documentation.
Code coverage
The light-blue line next to the blame strip shows the code coverage information.
Hovering a pointer over the coverage strip shows a coverage popup, which shows how many times the line is hit in the automation.
Nesting header
For nesting structures inside a source code, such as namespaces, classes, functions, etc, Searchfox shows a sticky header for the nesting.
Symbols
Clicking each symbol (functions, variables) opens Context menu.