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Distill.io Extension Not Working in Firefox? Fix Monitor Errors

Use Distill’s check log and View Details to identify why a Firefox monitor failed, then apply the fix for its specific error.
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If Distill.io is reporting an error in Firefox, open the monitor’s check log and select View Details first. The error code and captured snapshot help distinguish a hidden extension button, a local-versus-cloud mix-up, a stale page selection, or a site access problem—issues that need different fixes.

Start with the latest check details

  1. Open the Distill extension’s Watchlist and find the affected monitor.
  2. Open its check log and select View Details.
  3. Read the reported error and inspect the snapshot to see what Distill captured.

Distill bases a monitor’s state on its latest check: if that check errors, the monitor is shown in Error. Use the details of that check to choose a remedy rather than reinstalling the extension as a first step. Distill: Check Log

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Confirm whether the monitor is local or cloud-based

A local monitor runs through the browser extension on your device. Firefox must be open and available for it to check pages; as Distill puts it, “When your browser (Firefox) is not open, your webpages will not be monitored.” A cloud monitor runs on Distill’s servers and does not require your computer to remain on. Choose the matching device or interface when you run a monitor manually. Distill: Cloud vs. local monitors

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When either mode might work, consider whether the site blocks cloud access, needs an active browser tab or a local session, and whether the required login or cookies are available in that environment. There is no universally better mode; the site and your availability determine the fit.

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Distill lists minimum check intervals of two minutes for its Web App Flexi plan and five seconds for its browser add-on. These are product settings, not general performance guarantees, and can change; check Distill’s current plan information before relying on them.

If the Distill toolbar button is missing

The extension may be installed but its button may not be visible. Open Firefox’s extension controls and use toolbar customization to drag the Distill icon onto the toolbar. Firefox’s customization controls can vary by version. Mozilla Support: Customize Firefox controls, buttons and toolbars

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Match the error code to the likely cause

These are diagnostic starting points from Distill’s troubleshooting guide. A code narrows the investigation but does not guarantee that a single remedy will work for every site or monitor. Distill: Troubleshooting monitor errors

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Error What it can indicate What to try
E_BROWSER The extension could not open a tab or window; browser behavior or settings may be involved. Try Distill’s documented advanced page-loading option, refresh the extension or browser, and restart Firefox.
SELECTION_EMPTY The selected content no longer exists or was not present when the check ran. Inspect the snapshot, select the current content again, or add a delay so late-loading content can appear.
E_CONFIG The monitor configuration may be malformed, the URL invalid, or the selector type unsupported or invalid. Review the URL and the monitor’s configuration and selector.
E_FILTER_HTML Distill could not extract the selected content, potentially because the page structure changed or content loads dynamically. Check the snapshot, reselect the target with the visual selector, or add a delay.
E_FRAME_REQUEST The selected frame could not be found; redirects or timing may be relevant. Retry later, add a delay, and check the URL and any redirects.
E_TIMEOUT The page may need an active tab, the cloud request may be blocked, or the request may be slow. Test whether activating the tab changes the result. Then choose local or cloud monitoring, proxy use, or a delay based on the cause.
E_REQUEST_FORBIDDEN The site may require login or cookies, or may block the request. Check authentication and whether the chosen device has the needed session; consider a dedicated device, proxy, or local monitoring where appropriate.

Fix a missing or empty page selection

If the snapshot is blank where the monitored content should be, the target may have moved, the page structure may have changed, or the site may render the content after the check starts. Reselect the relevant content and, for delayed rendering, add a wait in the monitor configuration. Distill’s guide describes using a delay for content that appears after the initial page load. Distill: Selecting elements

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Investigate access, timeout, and CAPTCHA failures

Use the particular error and snapshot to decide whether the problem is the site’s access requirements or the execution environment. A page that needs an authenticated session or active rendering may be better suited to a local check; a site that blocks cloud access may call for a different device or proxy, where available. Local monitoring also requires Firefox and the device to be available. Do not assume that switching modes alone will solve a timeout or access denial.

If checks work but alerts do not arrive

  • Confirm that the monitor has a successful check and that the change appears in Change History.
  • Check whether the alert condition is actually met and the expected alert action is configured.
  • Check whether quota is available.

An errored check cannot detect a new change. Distill’s guide to alerts and notifications explains the alert configuration.

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Or skip the browser setup

If your goal is a screenshot rather than a recurring Distill monitor, ScreenshotNeo can return a website screenshot with one GET request. Its clean-shot steps accept cookie or consent banners and remove more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each step can be turned off. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and the response reports the page verdict and billing status in headers. Its MCP server offers screenshot tools for Claude, Cursor, and other MCP clients.

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Example using cURL (replace the URL with the page you want to capture):

curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp

See the ScreenshotNeo API documentation for request options. The free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000. Sign up for 1,000 free screenshots a month, with no card.

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