Mozilla removed sourceeditor.dtd and migrated gotoLine label to sourceeditor.ftl (change link).
To fix it, we just need the following changes on edit.xhtml:
<!DOCTYPE window [
<!ENTITY % editMenuStrings SYSTEM "chrome://global/locale/editMenuOverlay.dtd">
%editMenuStrings;
-<!ENTITY % sourceEditorStrings SYSTEM "chrome://devtools/locale/sourceeditor.dtd">
- %sourceEditorStrings;
]>
Mozilla removed sourceeditor.dtd and migrated gotoLine label to sourceeditor.ftl (change link). To fix it, we just need the following changes on edit.xhtml: