Run Playwright tests on Firefox & "Safari" nightly (#28757)

* Run Playwright tests on Firefox

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update playwright.config.ts

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update end-to-end-tests.yaml

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Finalise

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Documentation

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* typo

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

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Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

playwright/e2e/widgets/stickers.spec.ts

@@ -128,7 +128,7 @@ async function setWidgetAccountData(
     });
 }
 
-test.describe("Stickers", () => {
+test.describe("Stickers", { tag: ["@no-firefox", "@no-webkit"] }, () => {
     test.use({
         displayName: "Sally",
         room: async ({ app }, use) => {