code: package org.openqa.selenium.firefox;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.openqa.selenium.firefox.FirefoxAssumptions.assumeDefaultBrowserLocationUsed;
  
  import java.nio.file.Path;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.openqa.selenium.By;
  import org.openqa.selenium.WebElement;
  import org.openqa.selenium.build.InProject;
  import org.openqa.selenium.testing.JupiterTestBase;
  
  public class ExtensionsTest extends JupiterTestBase {
  
    private static final String EXT_XPI = "common/extensions/webextensions-selenium-example.xpi";
    private static final String EXT_SIGNED_ZIP =
        "common/extensions/webextensions-selenium-example.zip";
    private static final String EXT_UNSIGNED_ZIP =
        "common/extensions/webextensions-selenium-example-unsigned.zip";
    private static final String EXT_SIGNED_DIR =
        "common/extensions/webextensions-selenium-example-signed";
    private static final String EXT_UNSIGNED_DIR = "common/extensions/webextensions-selenium-example";
  
    @BeforeEach
    public void checkTestsAreExpectedToRunAndPass() {
      // I can't figure out why this is failing in EngFlow, but XPIs are no
      // longer actively developed (being replaced by Web Extensions), so I
      // think it's okay to skip this test if we're running remotely.
      assumeDefaultBrowserLocationUsed();
    }
  
    @Test
    void canAddRemoveXpiExtensions() {
      Path extension = InProject.locate(EXT_XPI);
  
      String id = ((HasExtensions) driver).installExtension(extension);
      assertThat(id).isEqualTo("webextensions-selenium-example@example.com");
  
      driver.get(pages.blankPage);
      WebElement injected = driver.findElement(By.id("webextensions-selenium-example"));
      assertThat(injected.getText()).isEqualTo("Content injected by webextensions-selenium-example");
  
      ((HasExtensions) driver).uninstallExtension(id);
  
      driver.navigate().refresh();
      assertThat(driver.findElements(By.id("webextensions-selenium-example")).size()).isZero();
    }
  
    @Test
    void canAddRemoveZipUnSignedExtensions() {
      Path extension = InProject.locate(EXT_UNSIGNED_ZIP);
  
      String id = ((HasExtensions) driver).installExtension(extension, true);
      assertThat(id).isEqualTo("webextensions-selenium-example@example.com");
  
      driver.get(pages.blankPage);
      WebElement injected = driver.findElement(By.id("webextensions-selenium-example"));
      assertThat(injected.getText()).isEqualTo("Content injected by webextensions-selenium-example");
  
      ((HasExtensions) driver).uninstallExtension(id);
  
      driver.navigate().refresh();
      assertThat(driver.findElements(By.id("webextensions-selenium-example")).size()).isZero();
    }
  
    @Test
    void canAddRemoveZipSignedExtensions() {
      Path extension = InProject.locate(EXT_SIGNED_ZIP);
  
      String id = ((HasExtensions) driver).installExtension(extension);
      assertThat(id).isEqualTo("webextensions-selenium-example@example.com");
  
      driver.get(pages.blankPage);
      WebElement injected = driver.findElement(By.id("webextensions-selenium-example"));
      assertThat(injected.getText()).isEqualTo("Content injected by webextensions-selenium-example");
  
      ((HasExtensions) driver).uninstallExtension(id);
  
      driver.navigate().refresh();
      assertThat(driver.findElements(By.id("webextensions-selenium-example")).size()).isZero();
    }
  
    @Test
    void canAddRemoveUnsignedExtensionsDirectory() {
      Path extension = InProject.locate(EXT_UNSIGNED_DIR);
  
      String id = ((HasExtensions) driver).installExtension(extension, true);
      assertThat(id).isEqualTo("webextensions-selenium-example@example.com");
  
      driver.get(pages.blankPage);
      WebElement injected = driver.findElement(By.id("webextensions-selenium-example"));
      assertThat(injected.getText()).isEqualTo("Content injected by webextensions-selenium-example");
  
      ((HasExtensions) driver).uninstallExtension(id);
  
      driver.navigate().refresh();
      assertThat(driver.findElements(By.id("webextensions-selenium-example")).size()).isZero();
    }
  
    @Test
    void canAddRemoveSignedExtensionsDirectory() {
      Path extension = InProject.locate(EXT_SIGNED_DIR);
  
      String id = ((HasExtensions) driver).installExtension(extension);
      assertThat(id).isEqualTo("webextensions-selenium-example@example.com");
  
      driver.get(pages.blankPage);
      WebElement injected = driver.findElement(By.id("webextensions-selenium-example"));
      assertThat(injected.getText()).isEqualTo("Content injected by webextensions-selenium-example");
  
      ((HasExtensions) driver).uninstallExtension(id);
  
      driver.navigate().refresh();
      assertThat(driver.findElements(By.id("webextensions-selenium-example")).size()).isZero();
    }
  }
  