When viewed on Firefox, if you copy a code snippet from Torchlight it adds an additional newline for every line. Copying an example on the homepage to the clipboard and then pasting results in the following:
<x-code-torchlight language='php'>
// Any code here will be highlighted by Torchlight!
</x-code-torchlight>
While on Chrome it copies like it should:
<x-code-torchlight language='php'>
// Any code here will be highlighted by Torchlight!
</x-code-torchlight>
It looks like Firefox copies the span.line-number as an empty line. I removed these elements from the DOM and then copying is as expected