Attempt to fix Firefox e2e test with context menus

test/e2e/downloads.test.ts

@@ -16,10 +16,7 @@ describe("Downloads (enabled)", ["--disable-workspace-trust"], {}, async () => {
     await fs.writeFile(tmpFilePath, "hello world")
 
     // Action
-    const fileInExplorer = await codeServerPage.page.waitForSelector("text=unique-file.txt")
-    await fileInExplorer.click({
-      button: "right",
-    })
+    await codeServer.openContextMenu("text=unique-file.txt")
 
     expect(await codeServerPage.page.isVisible("text=Download...")).toBe(true)
   })
@@ -73,10 +70,7 @@ describe("Downloads (disabled)", ["--disable-workspace-trust", "--disable-file-d
     await fs.writeFile(tmpFilePath, "Hello World")
 
     // Action
-    const fileInExplorer = await codeServerPage.page.waitForSelector("text=unique-file.txt")
-    await fileInExplorer.click({
-      button: "right",
-    })
+    await codeServer.openContextMenu("text=unique-file.txt")
 
     expect(await codeServerPage.page.isVisible("text=Download...")).toBe(false)
   })

test/e2e/models/CodeServer.ts

@@ -555,6 +555,19 @@ export class CodeServerPage {
     })
   }
 
+  /**
+   * Open context menu on the specified selector.
+   */
+  async openContextMenu(selector: string): Promise<void> {
+    // Firefox appears to have an issue with right clicking to show the context
+    // menu.  It seems to be related to VS Code trying to handle the clipboard
+    // although I am not sure why it presents in the file menu.  To work around
+    // it, left click and open the context menu using Shift+F10 instead.
+    const el = await this.page.waitForSelector(selector)
+    await el.click({ button: "left" })
+    await this.page.keyboard.press("Shift+F10")
+  }
+
   /**
    * Execute a command in the root of the instance's workspace directory.
    */