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Short answer: if the translation popup belongs to Firefox Nightly rather than the webpage, Playwright’s page locators and JavaScript-dialog handlers are not documented ways to click or dismiss it. First check the Firefox and Playwright versions you are testing; then, if translation prompts are not needed, manage the offer in Firefox’s translation settings. Playwright can launch Firefox with user preferences, but the exact preference for this Nightly popup is not established here, so verify any preference against your specific build before relying on it.
First identify which popup you are trying to close
A webpage dialog and a Firefox translation panel may look similarly intrusive, but they are controlled by different software. A webpage-owned element is part of the page content that Playwright can inspect and locate. A browser-owned panel is part of Firefox’s interface, outside the page’s DOM.
The reported Nightly problem was the latter: the reporter could close the panel manually, but page.getByText('Cancel').click() did not find a page element, and pressing Escape did not dismiss it. The accepted Stack Overflow answer said the issue was fixed in the then-current Playwright canary on November 3, 2023. That is a dated report, not a guarantee about every current Playwright and Firefox Nightly combination. See the original report and answer.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsThis distinction matters when debugging: repeatedly changing a locator or adding a page-level keyboard press cannot make Firefox-owned chrome become a webpage element. Playwright’s Locator documentation describes locators as the central mechanism for page auto-waiting and retrying. Its Dialog API concerns JavaScript dialogs such as alert, confirm, prompt, and beforeunload, not Firefox’s translation panel.
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Check the Playwright and Firefox versions before changing your test
Because the reported fix was specific to the canary available on November 3, 2023, establish what your test actually runs before adopting that answer as a fix. Record the installed Playwright version and whether the Firefox executable is the browser build managed by Playwright or a separately installed Nightly build. A result for one combination does not establish behavior for another.
- Check the installed package: in a Node project, run
npx playwright --versionandnpm ls playwright playwright-core. The second command helps reveal which package versions are present in that project. - Check the browser under test: make sure your test configuration launches the browser you intend to test. Do not assume that a system Firefox Nightly and Playwright’s installed Firefox build are interchangeable.
- Reproduce the failure in that exact combination: distinguish a popup that appears in Firefox’s interface from a consent or translation element rendered inside the website. If the latter is in the page, a locator may be appropriate; if it is Firefox chrome, it is not.
- Update deliberately: if you test a newer Playwright version, install and verify it in the project or CI environment that runs the test. The 2023 answer is useful historical context, but it does not identify a current minimum fixed version.
The report does not name a release number that can safely be treated as the universal cutoff. Avoid pinning a version based solely on the word “canary” in that answer; verify the behavior of the versions you actually deploy.
Manage the translation offer in Firefox when you do not need it
If the aim is to stop Firefox from offering translation during an automation run, changing Firefox’s translation settings is a more direct route than trying to click browser chrome from page code. Mozilla’s Firefox Translations help page, marked last updated June 7, 2026, explains that translation prompts can be managed for a language or site. It also notes: “Always offer to translate controls whether the panel opens automatically.”
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Use the settings that match your test’s purpose. If translation itself is not under test, suppressing the relevant offer can make a run less disruptive. If the test is intended to verify Firefox’s translation experience, disabling the offer would hide the behavior you mean to test; use a separate test profile or preserve the prompt instead. Firefox menu wording and settings locations can change between versions, so follow the translation controls present in the build you are testing rather than relying on a fixed menu path from another release.
Mozilla also documents a manual control for a selected-text translation popup: click Done to close it. That describes how a person can use the Firefox panel; it does not create a Playwright page locator for the panel.
Pass Firefox preferences at launch only after verifying the preference
Playwright supports supplying Firefox user preferences with the firefoxUserPrefs launch option; see the BrowserType documentation. The available evidence does not establish which exact preference key controls this Nightly popup in a current build. Do not copy an unverified key into a test and assume it is supported or effective.
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The following is a valid configuration shape, but intentionally contains no preference key: select and verify the preference for the exact Firefox version you use before adding it.
const { firefox } = require('playwright');
(async () => {
const browser = await firefox.launch({
headless: false,
firefoxUserPrefs: {
// Add a Firefox preference only after verifying the key and value
// for the Firefox build used by this test.
},
});
const page = await browser.newPage();
await page.goto('https://example.com');
// Run page-level assertions here. This does not click Firefox chrome.
await browser.close();
})();An empty preferences object does not disable translation; it demonstrates the supported launch-option location without inventing a setting. Once you identify a relevant preference from documentation or a controlled test for your Firefox build, add it here and verify that it changes the behavior you intend. Keep the preference scoped to the automation context if you do not want to change a person’s normal Firefox settings.
When a Playwright locator is the right solution
If inspection shows that the prompt is actually rendered by the website, use a locator for the page element and wait for it to become actionable. For example, the following pattern is appropriate only when a button labelled “Cancel” is genuinely part of the page DOM:
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const cancelButton = page.getByRole('button', { name: 'Cancel' });
await cancelButton.waitFor({ state: 'visible' });
await cancelButton.click();This is not a workaround for the Firefox-owned translation panel. Do not replace the locator with a JavaScript dialog handler unless the thing being handled is actually a JavaScript dialog. Playwright’s dialog events are for the browser’s handling of page-triggered JavaScript dialogs, not arbitrary browser interface panels.
Common failure modes and what to do
- “Cancel” cannot be found: the visible control may belong to Firefox, not the website. Confirm whether it appears in page content; if it is browser chrome, manage the offer through Firefox settings or a verified launch preference instead of a page locator.
- Escape leaves the popup open: the reported Nightly case behaved this way. Escape is not a reliable dismissal method for this panel; use Firefox’s translation controls or check the tested version combination.
- A dialog handler never fires: a translation panel is not one of the JavaScript dialogs covered by Playwright’s Dialog API. Use that API only for page-created alert, confirm, prompt, or before-unload dialogs.
- A preference appears to do nothing: first verify the preference key and value against the exact Firefox build. The launch option is supported, but the key for this popup is not established by the sources cited here.
- The panel returns after updating: record both browser and Playwright versions and test them together. The Stack Overflow answer’s canary fix was reported on November 3, 2023; it does not promise that a later configuration, different Nightly build, or unrelated popup issue is fixed.
- The panel overlaps other interface: Mozilla Bugzilla Bug 1880685 describes an issue involving overlap between Firefox translation offers and other UI. Treat that as context for investigating the Firefox interface, not as proof that a particular Playwright locator or preference will resolve your case.
Or skip the browser setup
If your real goal is to save a clean image of a webpage—not to test or control Firefox Nightly’s own interface—a screenshot API can avoid launching a local browser for that capture. ScreenshotNeo is a website screenshot API and MCP server; it does not dismiss Firefox chrome or replace a Playwright test of Firefox’s translation behavior.
One GET request returns an image or PDF. For example, this cURL command saves a WebP capture of the target page. See the ScreenshotNeo API documentation for request options.
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Frequently Asked Questions
Does Playwright support launching Firefox with its own browser preferences?
Yes. Playwright documents the firefoxUserPrefs launch option; the preference key and value for this particular popup still need to be verified for the Firefox build in use.
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