Sure, you make the necessary changes and submit a patch. You'll automatically get assigned then. Here is a searchfox query showing all uses of the function: https://searchfox.org/mozilla-central/search?q=AboutToLoadHttpFtpDocumentForChild&redirect=false.
Bug 1879304 Comment 2 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Sure, submitting a patch will automatically get you assigned. Here is a searchfox query showing all uses of the function: https://searchfox.org/mozilla-central/search?q=AboutToLoadHttpFtpDocumentForChild&redirect=false.