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diff --git a/devtools/client/debugger/src/reducers/source-blackbox.js b/devtools/client/debugger/src/reducers/source-blackbox.js
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+++ b/devtools/client/debugger/src/reducers/source-blackbox.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+/**
+ * Reducer containing all data about sources being "black boxed".
+ *
+ * i.e. sources which should be ignored by the debugger.
+ * Typically, these sources should be hidden from paused stack frames,
+ * and any debugger statement or breakpoint should be ignored.
+ */
+
+export function initialSourceBlackBoxState(state) {
+  return {
+    /* FORMAT:
+     * blackboxedRanges: {
+     *  [source url]: [range, range, ...], -- source lines blackboxed
+     *  [source url]: [], -- whole source blackboxed
+     *  ...
+     * }
+     */
+    blackboxedRanges: state?.blackboxedRanges ?? {},
+
+    blackboxedSet: state?.blackboxedRanges
+      ? new Set(Object.keys(state.blackboxedRanges))
+      : new Set(),
+
+    sourceMapIgnoreListUrls: [],
+  };
+}
+
+function update(state = initialSourceBlackBoxState(), action) {
+  switch (action.type) {
+    case "BLACKBOX_WHOLE_SOURCES": {
+      const { sources } = action;
+
+      const currentBlackboxedRanges = { ...state.blackboxedRanges };
+      const currentBlackboxedSet = new Set(state.blackboxedSet);
+
+      for (const source of sources) {
+        currentBlackboxedRanges[source.url] = [];
+        currentBlackboxedSet.add(source.url);
+      }
+
+      return {
+        ...state,
+        blackboxedRanges: currentBlackboxedRanges,
+        blackboxedSet: currentBlackboxedSet,
+      };
+    }
+
+    case "BLACKBOX_SOURCE_RANGES": {
+      const { source, ranges } = action;
+
+      const currentBlackboxedRanges = { ...state.blackboxedRanges };
+      const currentBlackboxedSet = new Set(state.blackboxedSet);
+
+      if (!currentBlackboxedRanges[source.url]) {
+        currentBlackboxedRanges[source.url] = [];
+        currentBlackboxedSet.add(source.url);
+      } else {
+        currentBlackboxedRanges[source.url] = [
+          ...state.blackboxedRanges[source.url],
+        ];
+      }
+
+      // Add new blackboxed lines in acsending order
+      for (const newRange of ranges) {
+        const index = currentBlackboxedRanges[source.url].findIndex(
+          range =>
+            range.end.line <= newRange.start.line &&
+            range.end.column <= newRange.start.column
+        );
+        currentBlackboxedRanges[source.url].splice(index + 1, 0, newRange);
+      }
+
+      return {
+        ...state,
+        blackboxedRanges: currentBlackboxedRanges,
+        blackboxedSet: currentBlackboxedSet,
+      };
+    }
+
+    case "UNBLACKBOX_WHOLE_SOURCES": {
+      const { sources } = action;
+
+      const currentBlackboxedRanges = { ...state.blackboxedRanges };
+      const currentBlackboxedSet = new Set(state.blackboxedSet);
+
+      for (const source of sources) {
+        delete currentBlackboxedRanges[source.url];
+        currentBlackboxedSet.delete(source.url);
+      }
+
+      return {
+        ...state,
+        blackboxedRanges: currentBlackboxedRanges,
+        blackboxedSet: currentBlackboxedSet,
+      };
+    }
+
+    case "UNBLACKBOX_SOURCE_RANGES": {
+      const { source, ranges } = action;
+
+      const currentBlackboxedRanges = {
+        ...state.blackboxedRanges,
+        [source.url]: [...state.blackboxedRanges[source.url]],
+      };
+
+      for (const newRange of ranges) {
+        const index = currentBlackboxedRanges[source.url].findIndex(
+          range =>
+            range.start.line === newRange.start.line &&
+            range.end.line === newRange.end.line
+        );
+
+        if (index !== -1) {
+          currentBlackboxedRanges[source.url].splice(index, 1);
+        }
+      }
+
+      return {
+        ...state,
+        blackboxedRanges: currentBlackboxedRanges,
+      };
+    }
+
+    case "ADD_SOURCEMAP_IGNORE_LIST_SOURCES":
+      if (action.status == "done") {
+        return {
+          ...state,
+          sourceMapIgnoreListUrls: [
+            ...state.sourceMapIgnoreListUrls,
+            ...action.value,
+          ],
+        };
+      }
+      return state;
+
+    case "NAVIGATE":
+      return initialSourceBlackBoxState(state);
+  }
+
+  return state;
+}
+
+export default update;