Copying from Firefox vs. copying from Safari — why this difference?

[auntanki]

(the Add-On editor: paste raw unfiltered full html is installed)

When I select a multi-line block in Firefox, it gets highlighted line by line; in Safari there is a one-block-selection. When pasted into Anki (Paste full html), the Safari-copy looks much nicer … Could this somehow be achieved copying from Firefox as well? (I don’t want to use Safari that much).

[abdo]

This is likely due to differences in what the two browsers copy (maybe Safari copies more stylings).