diff --git a/chrome/content/zotero/contextMenuUtils.sys.mjs b/chrome/content/zotero/contextMenuUtils.sys.mjs
index 3952cfa21d..a24ebfe688 100644
--- a/chrome/content/zotero/contextMenuUtils.sys.mjs
+++ b/chrome/content/zotero/contextMenuUtils.sys.mjs
@@ -22,6 +22,20 @@ export function getTargetElement(doc) {
  * @returns {{ clientX: number, clientY: number }}
  */
 function getContextMenuPosition(targetElement) {
+	// In theory, we could find the caret position using some privileged-code
+	// magic:
+	//
+	//   let x = {}, y = {}, w = {}, h = {};
+	//   Cc["@mozilla.org/accessibilityService;1"].getService(Ci.nsIAccessibilityService)
+	//   	.getAccessibleFor(targetElement)
+	//   	.QueryInterface(Ci.nsIAccessibleText)
+	//   	.getCaretRect(x, y, w, h);
+	//
+	// But this returns hardware screen units, doesn't work for selections, and
+	// doesn't *precisely* correspond to the position of the caret on screen
+	// without adjustments.
+	// Consider revisiting if the manual method gets too weighed down by edge cases.
+	
 	let selection;
 	if (targetElement.editor?.selection) {
 		selection = targetElement.editor.selection;
@@ -41,23 +55,53 @@ function getContextMenuPosition(targetElement) {
 	let anchorToEnd;
 	if (selection) {
 		let range = selection.getRangeAt(0);
+		
+		// Easy case: We have a range with rects, so use its bounding rect
 		if (range.getClientRects().length) {
 			rect = range.getBoundingClientRect();
+			
+			// ...Except an empty <input>'s text node will be anchored
+			// to the bottom with height 0, so move the rect to the top
+			if (rect.height === 0
+					&& range.collapsed
+					&& range.startContainer.isNativeAnonymous
+					&& range.startContainer.parentElement?.getClientRects().length) {
+				// We know we have a mutable DOMRect here, so we can
+				// mutate without cloning
+				rect.y = range.startContainer.parentElement.getBoundingClientRect().y;
+				
+				anchorToBottom = false;
+				anchorToEnd = true;
+			}
 		}
-		// If the selection is between lines in an editor, it'll be
-		// inside the editor's native anonymous text node and won't
-		// have any rects for some reason.
+		// If the caret is between lines in an editor, it'll be inside the
+		// editor's native anonymous text node and won't have any rects for
+		// some reason.
 		// If that's the case, use the text node's bounds.
-		else if (range.startContainer === range.endContainer && range.startContainer.isNativeAnonymous
+		else if (range.collapsed && range.startContainer.isNativeAnonymous
 				&& range.startContainer.firstChild?.nodeType === Node.TEXT_NODE) {
 			let quads = range.startContainer.firstChild.getBoxQuads();
 			rect = quads[quads.length - 1].getBounds();
 		}
+		// In a contenteditable (ProseMirror), when the selection is in an
+		// empty block or at the end of a block, it won't be within a text node
+		// and won't have any rects. Place at the end of the previous node.
+		else if (range.startContainer === range.endContainer
+				&& range.startOffset === range.endOffset
+				&& range.startOffset < range.startContainer.childNodes.length) {
+			range = range.cloneRange();
+			range.selectNode(range.startContainer.childNodes[range.startOffset]);
+			rect = range.getBoundingClientRect();
+			
+			anchorToBottom = false;
+			anchorToEnd = true;
+		}
 		else {
 			rect = range.commonAncestorContainer.getBoundingClientRect();
 		}
-		anchorToBottom = !range.collapsed;
-		anchorToEnd = range.collapsed;
+		
+		anchorToBottom ??= !range.collapsed;
+		anchorToEnd ??= range.collapsed;
 	}
 	else {
 		rect = targetElement.getBoundingClientRect();