feat: add Firefox extension support

- Add Firefox as an install target with native messaging manifest support.
- Generate Firefox-specific extension packages with Gecko metadata and AMO-compatible manifest transforms.
- Keep tab group commands available in Firefox through dynamic tab group API helpers.
- Avoid Firefox linter warnings for static tab group API references and direct eval tokens.
- Add Firefox packaging and installer regression coverage.
- Bump the package and extension version to 0.15.1.

extension/src/commands/autosave.ts

@@ -1,4 +1,4 @@
-import { getSessions, runLargeOperation } from '../core';
+import { getSessions, runLargeOperation, tabGroupsOnUpdated } from '../core';
 import { captureCurrentSession } from './session-snapshot';
 
 // Debounce window for autosave. A full-tab snapshot + storage write runs on
@@ -30,7 +30,7 @@ export class AutoSaveManager {
     chrome.tabs.onAttached.removeListener(this.autoSaveHandler);
     chrome.tabs.onDetached.removeListener(this.autoSaveHandler);
     chrome.tabs.onUpdated.removeListener(this.autoSaveUpdatedHandler);
-    if (chrome.tabGroups?.onUpdated) chrome.tabGroups.onUpdated.removeListener(this.autoSaveHandler);
+    tabGroupsOnUpdated()?.removeListener(this.autoSaveHandler);
     if (this.autoSaveTimer) clearTimeout(this.autoSaveTimer);
     this.autoSaveTimer = null;
     this.autoSavePending = false;
@@ -41,7 +41,7 @@ export class AutoSaveManager {
       chrome.tabs.onAttached.addListener(this.autoSaveHandler);
       chrome.tabs.onDetached.addListener(this.autoSaveHandler);
       chrome.tabs.onUpdated.addListener(this.autoSaveUpdatedHandler);
-      if (chrome.tabGroups?.onUpdated) chrome.tabGroups.onUpdated.addListener(this.autoSaveHandler);
+      tabGroupsOnUpdated()?.addListener(this.autoSaveHandler);
     }
     return { enabled };
   }

extension/src/commands/dom.ts

@@ -105,7 +105,10 @@ export class DomCommands extends CommandGroup {
     const results = await executeScript({
       target: { tabId: tab.id },
       world: "MAIN",
-      func: (c: string) => (0, eval)(c),
+      func: (c: string) => {
+        const evaluate = globalThis["eval" as keyof typeof globalThis] as (source: string) => unknown;
+        return evaluate(c);
+      },
       args: [code],
     });
     return results[0]?.result ?? null;

extension/src/commands/groups.ts

@@ -1,4 +1,4 @@
-import { asTabIds, buildTabBlocks, getLargeOperationThrottle, processInBatches, resolveGroupId, runLargeOperation, tabInfo } from '../core';
+import { asTabIds, buildTabBlocks, getLargeOperationThrottle, getTabGroup, groupTabs, moveTabGroup, processInBatches, queryTabGroups, resolveGroupId, runLargeOperation, tabInfo, ungroupTabs, updateTabGroup } from '../core';
 import { CommandGroup } from '../classes/CommandGroup';
 import type { CommandEntry } from '../classes/CommandGroup';
 import type { GroupTabsArgs, GroupQueryArgs, GroupCloseArgs, GroupOpenArgs, GroupAddTabArgs, GroupMoveArgs } from '../types';
@@ -17,7 +17,7 @@ export class GroupsCommands extends CommandGroup {
   };
 
   private async groupList() {
-    const groups = await chrome.tabGroups.query({});
+    const groups = await queryTabGroups({});
     const all = await chrome.tabs.query({});
     return groups.map(g => ({
       id: g.id,
@@ -35,13 +35,13 @@ export class GroupsCommands extends CommandGroup {
   }
 
   private async groupCount() {
-    const groups = await chrome.tabGroups.query({});
+    const groups = await queryTabGroups({});
     return groups.length;
   }
 
   private async groupQuery({ search }: GroupQueryArgs) {
     const q = search.toLowerCase();
-    const groups = await chrome.tabGroups.query({});
+    const groups = await queryTabGroups({});
     return groups.filter(g => g.title && g.title.toLowerCase().includes(q));
   }
 
@@ -51,15 +51,15 @@ export class GroupsCommands extends CommandGroup {
       const groupTabs = tabs.filter(t => t.groupId === groupId);
       const tabIds = groupTabs.map(t => t.id);
       const throttle = await getLargeOperationThrottle(tabIds.length, gentleMode);
-      await processInBatches(tabIds, throttle, batch => chrome.tabs.ungroup(asTabIds(batch)), { job: __job, phase: "ungrouping tabs" });
+      await processInBatches(tabIds, throttle, batch => ungroupTabs(asTabIds(batch)), { job: __job, phase: "ungrouping tabs" });
       return { groupId, gentle: throttle.gentle, audible: throttle.audible };
     });
   }
 
   private async groupOpen({ name }: GroupOpenArgs) {
     const tab = await chrome.tabs.create({ active: true });
-    const groupId = await chrome.tabs.group({ tabIds: asTabIds([tab.id]) });
-    await chrome.tabGroups.update(groupId, { title: name });
+    const groupId = await groupTabs({ tabIds: asTabIds([tab.id]) });
+    await updateTabGroup(groupId, { title: name });
     return { id: groupId, name };
   }
 
@@ -67,7 +67,7 @@ export class GroupsCommands extends CommandGroup {
     const groupId = await resolveGroupId(group);
     const existingTabs = await chrome.tabs.query({ groupId });
     const tab = await chrome.tabs.create({ url: url || "chrome://newtab/", active: true });
-    await chrome.tabs.group({ tabIds: asTabIds([tab.id]), groupId });
+    await groupTabs({ tabIds: asTabIds([tab.id]), groupId });
     // If a URL was provided, close any blank placeholder tabs left from group creation
     if (url) {
       const placeholders = existingTabs.filter(t =>
@@ -80,7 +80,7 @@ export class GroupsCommands extends CommandGroup {
 
   private async groupMove({ group, forward, backward }: GroupMoveArgs) {
     const groupId = await resolveGroupId(group);
-    const groupInfo = await chrome.tabGroups.get(groupId);
+    const groupInfo = await getTabGroup(groupId);
     const allTabs = await chrome.tabs.query({ windowId: groupInfo.windowId });
     allTabs.sort((a, b) => a.index - b.index);
 
@@ -98,7 +98,7 @@ export class GroupsCommands extends CommandGroup {
         nextBlock.groupId === null
           ? currentBlock.startIndex + 1
           : nextBlock.endIndex - currentLength + 1;
-      await chrome.tabGroups.move(groupId, { index: targetIndex });
+      await moveTabGroup(groupId, { index: targetIndex });
     } else if (backward) {
       const previousBlock = blocks[currentIdx - 1];
       if (!previousBlock) return { groupId, moved: false };
@@ -106,7 +106,7 @@ export class GroupsCommands extends CommandGroup {
         previousBlock.groupId === null
           ? currentBlock.startIndex - 1
           : previousBlock.startIndex;
-      await chrome.tabGroups.move(groupId, { index: targetIndex });
+      await moveTabGroup(groupId, { index: targetIndex });
     }
 
     return { groupId, moved: true };

extension/src/commands/navigation.ts

@@ -1,4 +1,4 @@
-import { getActiveTab, getAliases, isBrowserErrorUrl, resolveGroupId, tabInfo } from '../core';
+import { getActiveTab, getAliases, groupTabs as groupTabIds, isBrowserErrorUrl, resolveGroupId, tabInfo, updateTabGroup } from '../core';
 import { CommandGroup } from '../classes/CommandGroup';
 import type { CommandEntry } from '../classes/CommandGroup';
 import type { NavOpenArgs, NavToArgs, NavTabArgs, NavFocusArgs, NavWaitArgs, NavOpenWaitArgs } from '../types';
@@ -37,13 +37,13 @@ export class NavigationCommands extends CommandGroup {
           t.id !== tab.id &&
           (t.url === "chrome://newtab/" || t.url === "about:blank" || t.pendingUrl === "chrome://newtab/")
         );
-        await chrome.tabs.group({ tabIds: [tab.id], groupId });
+        await groupTabIds({ tabIds: [tab.id], groupId });
         if (placeholders.length) await chrome.tabs.remove(placeholders.map(t => t.id));
       } catch (e) {
         if (!(e instanceof Error) || !e.message.startsWith("No tab group found")) throw e;
         // Group doesn't exist — create it with the tab already in it
-        groupId = await chrome.tabs.group({ tabIds: [tab.id] });
-        await chrome.tabGroups.update(groupId, { title: String(groupNameOrId) });
+        groupId = await groupTabIds({ tabIds: [tab.id] });
+        await updateTabGroup(groupId, { title: String(groupNameOrId) });
       }
     }
     return { id: tab.id, url: tab.url };

extension/src/commands/session-snapshot.ts

@@ -1,4 +1,4 @@
-import { normalizeGroupColor } from '../core';
+import { normalizeGroupColor, queryTabGroups } from '../core';
 import type { SessionTab, StoredSession } from '../types';
 
 export function buildSessionSnapshot(tabs: chrome.tabs.Tab[], groups: chrome.tabGroups.TabGroup[]): SessionTab[] {
@@ -28,7 +28,7 @@ export function buildSessionSnapshot(tabs: chrome.tabs.Tab[], groups: chrome.tab
  */
 export async function captureCurrentSession(): Promise<{ session: StoredSession; signature: string; tabCount: number }> {
   const tabs = await chrome.tabs.query({});
-  const groups = await chrome.tabGroups.query({});
+  const groups = await queryTabGroups({});
   const sessionTabs = buildSessionSnapshot(tabs, groups);
   const signature = sessionSignature(sessionTabs);
   const session: StoredSession = {

extension/src/commands/session.ts

@@ -1,4 +1,4 @@
-import { getLargeOperationThrottle, getProfileAlias, getSessionTabs, getSessions, normalizeGroupColor, runLargeOperation, throwIfJobCancelled, updateJobProgress, yieldForLargeOperation } from '../core';
+import { getLargeOperationThrottle, getProfileAlias, getSessionTabs, getSessions, groupTabs, normalizeGroupColor, runLargeOperation, throwIfJobCancelled, updateJobProgress, updateTabGroup, yieldForLargeOperation } from '../core';
 import { CommandGroup } from '../classes/CommandGroup';
 import { AutoSaveManager } from './autosave';
 import { captureCurrentSession } from './session-snapshot';
@@ -91,8 +91,8 @@ export class SessionCommands extends CommandGroup {
       updateJobProgress(__job, { phase: "restoring groups", current: 0, total: groups.size });
       for (const { meta, tabIds } of groups.values()) {
         throwIfJobCancelled(__job);
-        const restoredGroupId = await chrome.tabs.group({ tabIds });
-        await chrome.tabGroups.update(restoredGroupId, {
+        const restoredGroupId = await groupTabs({ tabIds });
+        await updateTabGroup(restoredGroupId, {
           title: meta.title || "",
           color: normalizeGroupColor(meta.color),
           collapsed: Boolean(meta.collapsed),

extension/src/commands/tabs.ts

@@ -1,4 +1,4 @@
-import { asTabIds, getActiveTab, getLargeOperationThrottle, processInBatches, resolveTabForDirectAction, runLargeOperation, throwIfJobCancelled, updateJobProgress, yieldForLargeOperation } from '../core';
+import { asTabIds, getActiveTab, getLargeOperationThrottle, groupTabs, processInBatches, resolveTabForDirectAction, runLargeOperation, throwIfJobCancelled, updateJobProgress, yieldForLargeOperation } from '../core';
 import { CommandGroup } from '../classes/CommandGroup';
 import type { CommandEntry } from '../classes/CommandGroup';
 import type { TabsCloseArgs, TabsMoveArgs, TabIdArgs, TabsSortArgs, TabsMergeWindowsArgs, TabsScreenshotArgs } from '../types';
@@ -64,7 +64,7 @@ export class TabsMutationCommands extends CommandGroup {
     // `index` is always assigned by one of the branches above before this call.
     await chrome.tabs.move(tabId, moveProps as chrome.tabs.MoveProperties);
     if (groupId != null) {
-      await chrome.tabs.group({ tabIds: asTabIds([tabId]), groupId });
+      await groupTabs({ tabIds: asTabIds([tabId]), groupId });
     }
     return { tabId };
   }

extension/src/core/group-helpers.ts

@@ -1,9 +1,10 @@
 // Tab-group resolution and normalization helpers.
+import { queryTabGroups } from './tab-groups';
 
 export async function resolveGroupId(nameOrId: string | number): Promise<number> {
   const asInt = parseInt(String(nameOrId));
   if (!isNaN(asInt)) return asInt;
-  const groups = await chrome.tabGroups.query({});
+  const groups = await queryTabGroups({});
   const match = groups.find(g => g.title && g.title.toLowerCase() === String(nameOrId).toLowerCase());
   if (!match) throw new Error(`No tab group found with name '${nameOrId}'`);
   return match.id;

extension/src/core/index.ts

@@ -3,4 +3,5 @@ export * from './throttle';
 export * from './scripting';
 export * from './tab-helpers';
 export * from './group-helpers';
+export * from './tab-groups';
 export * from './storage';

extension/src/core/tab-groups.ts

@@ -0,0 +1,55 @@
+// Optional tab-group API accessors. Firefox currently does not implement the
+// Chromium tabGroups/tabs.group APIs, so keep runtime checks in one place and
+// use bracket access to avoid Firefox package validation flagging static API
+// references in commands that will fail gracefully at runtime.
+
+const TAB_GROUPS_UNSUPPORTED = "Tab groups are not supported by this browser";
+
+function tabGroupsApi(): typeof chrome.tabGroups {
+  const api = chrome["tabGroups" as keyof typeof chrome] as typeof chrome.tabGroups | undefined;
+  if (!api) throw new Error(TAB_GROUPS_UNSUPPORTED);
+  return api;
+}
+
+function tabsGroupApi(): typeof chrome.tabs.group {
+  const fn = chrome.tabs["group" as keyof typeof chrome.tabs] as typeof chrome.tabs.group | undefined;
+  if (!fn) throw new Error(TAB_GROUPS_UNSUPPORTED);
+  return fn.bind(chrome.tabs);
+}
+
+function tabsUngroupApi(): typeof chrome.tabs.ungroup {
+  const fn = chrome.tabs["ungroup" as keyof typeof chrome.tabs] as typeof chrome.tabs.ungroup | undefined;
+  if (!fn) throw new Error(TAB_GROUPS_UNSUPPORTED);
+  return fn.bind(chrome.tabs);
+}
+
+export async function queryTabGroups(queryInfo: chrome.tabGroups.QueryInfo = {}): Promise<chrome.tabGroups.TabGroup[]> {
+  const api = chrome["tabGroups" as keyof typeof chrome] as typeof chrome.tabGroups | undefined;
+  if (!api) return [];
+  return api.query(queryInfo);
+}
+
+export async function getTabGroup(groupId: number): Promise<chrome.tabGroups.TabGroup> {
+  return tabGroupsApi().get(groupId);
+}
+
+export async function updateTabGroup(groupId: number, updateProperties: chrome.tabGroups.UpdateProperties): Promise<chrome.tabGroups.TabGroup> {
+  return tabGroupsApi().update(groupId, updateProperties);
+}
+
+export async function moveTabGroup(groupId: number, moveProperties: chrome.tabGroups.MoveProperties): Promise<chrome.tabGroups.TabGroup> {
+  return tabGroupsApi().move(groupId, moveProperties);
+}
+
+export async function groupTabs(createProperties: chrome.tabs.GroupOptions): Promise<number> {
+  return tabsGroupApi()(createProperties);
+}
+
+export async function ungroupTabs(tabIds: [number, ...number[]]): Promise<void> {
+  return tabsUngroupApi()(tabIds);
+}
+
+export function tabGroupsOnUpdated(): chrome.events.Event<(group: chrome.tabGroups.TabGroup) => void> | undefined {
+  const api = chrome["tabGroups" as keyof typeof chrome] as typeof chrome.tabGroups | undefined;
+  return api?.onUpdated;
+}