@@ -107,3 +107,29 @@ user_pref("dom.security.https_only_mode_ever_enabled", true);

 /// User interface

 // Don't hide toolbars in fullscreen

 user_pref("browser.fullscreen.autohide", false);

+

+/// Clipboard

+// Disable legacy `document.execCommand()` with `"cut"` and `"copy"` arguments.

+// <https://developer.mozilla.org/en-US/docs/Web/API/Document/execCommand#cut>

+// <https://developer.mozilla.org/en-US/docs/Web/API/Document/execCommand#copy>

+user_pref("dom.allow_cut_copy", false);

+// Disable `document.addEventListener()` with `"cut"`, `"copy"`, and `"paste"`

+// arguments.

+// <https://developer.mozilla.org/en-US/docs/Web/API/Document/cut_event>

+// <https://developer.mozilla.org/en-US/docs/Web/API/Document/copy_event>

+// <https://developer.mozilla.org/en-US/docs/Web/API/Document/paste_event>

+user_pref("dom.event.clipboardevents.enabled", false);

+// Disable `window.navigator.clipboard` `read{,Text}` and `write{,Text}` async

+// calls, which take/return a `ClipboardItem` (formerly `DataTransfer`). (Only

+// `read` requires explicit permission from the user, not `write`.)

+// <https://developer.mozilla.org/en-US/docs/Web/API/Window/navigator>

+// <https://developer.mozilla.org/en-US/docs/Web/API/Navigator/clipboard>

+// <https://developer.mozilla.org/en-US/docs/Web/API/Clipboard>

+// <https://developer.mozilla.org/en-US/docs/Web/API/ClipboardItem>

+// <https://developer.mozilla.org/en-US/docs/Web/API/ClipboardEvent>

+// <https://developer.mozilla.org/en-US/docs/Web/API/ClipboardItem>

+// <https://hg.mozilla.org/mozilla-central/rev/7ea0b5653ebeb4ccf6f697bac20698725e2b44c7>

+// <https://hg.mozilla.org/mozilla-central/rev/7dedaec9dba5faa3d3549ca868ccc278e293db42>

+user_pref("dom.events.asyncClipboard.dataTransfer", false);

+user_pref("dom.events.asyncClipboard.clipboardItem", false);

+user_pref("dom.events.asyncClipboard.readText", false);