[Firefox] Line breaks are lost when copying function/constructor signature

[IgnatBeresnev]

Describe the bug
Reproduced only with Firefox, other browsers work as expected: line breaks are lost when pasting content from function/constructor parameters wrapping (introduced in #2309)

There's a very old bug in mozilla's tracker: https://bugzilla.mozilla.org/show_bug.cgi?id=492147

Expected behaviour
Content should be copied as

class PrimaryConstructorWithVals(
    val valString: String = "val def", 
    var varString: String = "var def", 
    var valStringWithoutDefaultValue: String, 
    paramString: String
)

Actual behaviour
Content is copied as

class PrimaryConstructorWithVals(    val valString: String = "val def",     var varString: String = "var def",     var valStringWithoutDefaultValue: String,     paramString: String)

To Reproduce
Generate dokkaHtml for a function/constructor with 3+ parameters, try to copy it (either via the copy button or by selecting) and paste somewhere

Installation

• Browser: Firefox 96.0
• Dokka version: 1.6.20

Additional context
Using \a also doesn't work.

.parameters.wrapped > .parameter {
    content: '\a';
}

[IgnatBeresnev]

Not relevant anymore as the copy signature button was removed in #2577