feat(firefox-stable): roll Firefox-Stable to Firefox v89 (#6833)

References #6817

browsers.json

@@ -13,7 +13,7 @@
     },
     {
       "name": "firefox-stable",
-      "revision": "1257",
+      "revision": "1259",
       "installByDefault": false
     },
     {

tests/headful.spec.ts

@@ -150,7 +150,6 @@ it('Page.bringToFront should work', async ({browserType, browserOptions}) => {
 it('focused input should produce the same screenshot', async ({browserType, browserOptions, browserName, platform, channel}, testInfo) => {
   it.fail(browserName === 'firefox' && platform === 'darwin', 'headless has thinner outline');
   it.fail(browserName === 'firefox' && platform === 'linux', 'headless has no outline');
-  it.fail(browserName === 'firefox' && platform === 'win32' && (channel as any !== 'firefox-stable'), 'headless has outline since new version');
   it.skip(browserName === 'webkit' && platform === 'linux', 'gtk vs wpe');
   it.skip(!!process.env.CRPATH);