| Index: _locales/en_US/messages.json | 
| =================================================================== | 
| --- a/_locales/en_US/messages.json | 
| +++ b/_locales/en_US/messages.json | 
| @@ -187,5 +187,25 @@ | 
| "whitelisted_domains": { | 
| "description": "This is a tab heading.", | 
| "message": "Whitelisted domains" | 
| + }, | 
| + "unexpected_filter_list_header": { | 
| + "message": "Filter list headers aren't allowed here" | 
| + }, | 
| + "invalid_css_selector": { | 
| + "message": "$selector$ is not a valid CSS selector", | 
| + "placeholders": { | 
| + "selector": { | 
| + "content": "$1" | 
| + } | 
| + } | 
| + }, | 
| + "line": { | 
| + "message": "Line $number$", | 
| + "description": "Prepended to error messages to indicate the line number (e.g. \"Line 42: Some error on this line\")", | 
| + "placeholders": { | 
| + "number": { | 
| + "content": "$1" | 
| + } | 
| + } | 
| } | 
| } |