feat: add Ask ChatGPT toolbar action

README.md

@@ -25,6 +25,12 @@ You can also press **Alt+Shift+G** to use the current selection. With nothing
 selected, the shortcut opens a blank chat. Change the shortcut under
 **Manage Extension Shortcuts** in the `about:addons` gear menu.
 
+Click the extension’s **Ask ChatGPT** toolbar button to use selected text or,
+with nothing selected, open a blank chat. On pages Firefox does not allow
+extensions to read, the button opens a blank chat. You can pin the button to
+the toolbar from Firefox’s extensions menu. It uses your saved prompt and
+tab/window preferences, and works even when the context menu is Off.
+
 The options panel shows your currently configured shortcut and refreshes when
 it changes or you return to the panel. If you remove it, the panel shows
 “No keyboard shortcut assigned”. Its **Change keyboard shortcut** button opens
@@ -32,7 +38,7 @@ Firefox’s shortcut editor when supported; otherwise follow the menu path above
 **Restore defaults** does not change your keyboard shortcut.
 
 To customize the prompt, set **Prompt template** to something like
-`Explain simply: {query}` or `Translate into Spanish: {query}`. The Simple menu action, Ask normally, and the shortcut use your template.
+`Explain simply: {query}` or `Translate into Spanish: {query}`. The Simple menu action, Ask normally, toolbar button, and shortcut use your template.
 Other advanced actions use their own dedicated prompts.
 
 ## Search keyword and default engine
@@ -53,8 +59,8 @@ Open `about:addons`, select this extension, and choose the **Options** tab
 (**Preferences** on macOS and Linux). Available settings:
 
 - **Context menu** — **Simple** (default) keeps the direct selection action;
-  **Advanced** offers contextual presets; **Off** hides the menu. The keyboard
-  shortcut works in every mode. Existing enabled/disabled preferences migrate
+  **Advanced** offers contextual presets; **Off** hides the menu. The toolbar
+  button and keyboard shortcut work in every mode. Existing enabled/disabled preferences migrate
   to Simple/Off. Changes apply without restarting Firefox.
 - **Show Translate in advanced menu** — off by default. When enabled, choose
   **Ask each time** for a language dialog, or enter a **Preferred language**
@@ -84,14 +90,14 @@ that cannot fit are rejected. The extension does not simulate submission; ChatGP
 prompt is sent automatically or waits in the composer.
 
 These settings apply to selecting text and choosing
-**Ask ChatGPT** from the right-click menu, or pressing
+**Ask ChatGPT** from the right-click menu, clicking the toolbar button, or pressing
 <kbd>Alt</kbd>+<kbd>Shift</kbd>+<kbd>G</kbd>. Rebind the shortcut under
 **Manage Extension Shortcuts** in the Add-ons gear menu.
 
 The `gpt <query>` address-bar search is unchanged and does not read these
 settings.
 
-The options panel, the right-click item, and the keyboard shortcut require
+The options panel, toolbar button, right-click item, and keyboard shortcut require
 Firefox 112 or newer. On older versions the extension still installs and the
 `gpt <query>` address-bar search still works; only these newer features are
 inactive.
@@ -102,6 +108,10 @@ The extension opens ChatGPT with the prompt in the URL. ChatGPT controls what
 happens next: it may send the prompt automatically or leave it in the composer.
 **If the prompt is not sent automatically, press Enter in ChatGPT.**
 
+If ChatGPT shows a verification error, try signing in and opening the prompt
+again. Signing in has helped in testing, but does not guarantee automatic
+submission.
+
 The extension does not click Send, simulate Enter, or call ChatGPT's internal
 conversation API. This behavior can vary with changes to ChatGPT itself.
 
@@ -145,7 +155,7 @@ reported to Zavage Software.
 - Your settings are stored in your own browser profile. If you use Firefox Sync
   with **Add-ons** enabled, they sync end-to-end encrypted through your own
   Mozilla account.
-- Selection actions and the shortcut place your selected text in the ChatGPT
+- Selection actions, the toolbar button, and the shortcut place your selected text in the ChatGPT
   URL. Advanced link/page actions instead place the chosen link or current
   page URL in the prompt. URLs may include private query parameters or fragments;
   use those actions only for URLs you want to share with ChatGPT.