Fix the Dashlane Extension Not Working on Some Sites in Firefox

Dashlane autofills on most sites, then refuses to touch one particular login page in Firefox. Your vault is probably fine. Firefox is blocking the extension on that site, or the saved address does not match.

Start with the extension's site access in about:addons, confirm you are signed in (green icon, not orange), and check that the saved login matches the page address. Then test without another password manager.

In this guide, I have covered:

Why the Dashlane Firefox Extension Skips Certain Sites

Dashlane fills one login without complaint, then ignores the next. That is rarely a broken extension. Firefox grants extension access site by site, so the same add-on can be allowed on one website and blocked on another.

A saved login can fail the same way. When the address stored in Dashlane differs from the page you are signing in on, autofill never fires. Check the Dashlane icon on the failing page first: green means you are signed in, orange means you are not.

Everything below applies to Firefox on a computer. Dashlane’s extension does not run in Firefox on mobile.

Allow Dashlane on the Affected Website

Dashlane works on every other site but stays quiet on this one. Start with Firefox’s extension permissions, because a site-specific restriction is the most direct cause.

1. Open Firefox’s menu and select Add-ons and themes.
2. Find Dashlane in the Extensions list and click the More options button for the extension.
3. Open the Permissions tab.
4. Locate Access your data for websites in Firefox and open its site-access menu.
5. Select Always activate on this site, or choose the affected website from the permission list.
6. Reload the website and check whether Dashlane detects its login fields.

You’ll know it worked when the Dashlane icon appears in the toolbar on that site and its saved login shows up on the form.

Firefox may display site access as Ask for access, Always activate on this site, or When you click the toolbar button. Give the affected site the level that lets Dashlane run there without you clicking anything.

Confirm Dashlane Is Enabled and Signed In

Site access already looks correct, yet autofill still does nothing. Now check that Firefox has loaded the current extension and that Dashlane still recognizes your account.

1. Open Firefox’s menu and select Add-ons and themes.
2. Find Dashlane and review its enabled status.
3. Select Check for Updates if that option is available.
4. Click the Dashlane toolbar icon on any ordinary webpage.
5. Sign in to Dashlane if the icon is orange or the extension asks you to log in.
6. Reload the website where autofill failed.

A green icon means you are signed in. Orange means you are not, and nothing fills until you sign in through the extension.

If the icon stays orange after signing in, stop here and fix the account first. Dashlane cannot reach your vault, so no site permission will rescue it.

RELATED: Fix Firefox Not Loading a Website That Works in Other Browsers

Match the Saved Login to the Website Address

The site loads, Dashlane is signed in, and there is still no autofill suggestion. That usually means the address stored with the credential does not match the page in front of you.

1. Open the Dashlane toolbar icon and switch to the list containing your saved logins.
2. Locate the login used by the affected website.
3. Open the credential’s details and check its stored website address.
4. Correct the address so it matches the domain you use to sign in.
5. Save the updated credential.
6. Reload the website and try the Dashlane autofill suggestion again.

Watch the protocol and the subdomain. A login saved for one host does not always fill on a sign-in page served from a different subdomain, and it will not fill at all if the stored address still says http while the site now forces https.

You’ll know it worked when Dashlane lists the credential the moment you click the username field.

Disable Other Password Managers

A second password manager is installed and Dashlane only fills some of your forms. Two extensions competing for the same login fields will do exactly that.

1. Open Firefox’s menu and select Add-ons and themes.
2. Review the enabled extensions for another password manager.
3. Open the competing extension’s More options menu.
4. Select Disable if it is not needed.
5. Reload the affected webpage and test Dashlane again.

Do not leave a manager you rely on switched off permanently. Use the test to confirm the conflict, then keep exactly one extension actively filling logins in Firefox.

Check Firefox Private Windows

Everything works in a normal tab and fails in a private window. Private browsing keeps its own extension access, so Dashlane can be fully enabled and still be off there.

1. Open Firefox’s menu and select Add-ons and themes.
2. Find Dashlane and open its More options menu.
3. Select Permissions.
4. Find the setting that allows the extension to run in private windows and enable it if permitted.
5. Open a new private window and test the affected website.

If your organization or your Firefox installation prevents private-window access, keep using a normal window for that site.

Private browsing does not grant per-site permission on its own. You may still need to allow Dashlane on the individual website after opening it in a private window.

Reset Firefox’s Extension State

Permissions, sign-in, saved address, and conflicts all look right, and the extension still misbehaves. A clean reinstall is the next step. It takes a couple of minutes and clears the stuck states you cannot see.

1. Open Firefox’s menu and select Add-ons and themes.
2. Find Dashlane and open its More options menu.
3. Select Remove and confirm the removal if you intend to reinstall it.
4. Open the official Mozilla support guidance for extension permission problems if the reinstall does not help.
5. Reinstall Dashlane from the Firefox Add-ons site and select Add when prompted.
6. Allow private-window access if you need it and sign in to Dashlane.
7. Test the affected website again.

Removing and reinstalling the extension may ask you to sign in again, but it should not remove the credentials stored in your Dashlane account.

Quick Checks for Other Site-Specific Problems

None of that changed the result. Before you touch anything else, rule out the page itself and the saved record.

• Confirm that the affected login page has loaded completely and that the username or password field is not blocked by an overlay.
• Open the saved Dashlane entry manually and confirm that the web address and username are correct.
• Use the Dashlane toolbar icon rather than expecting a saved login to appear automatically.
• Check whether the site uses a sign-in domain that differs from the domain stored in Dashlane.
• Clear the site’s stored data if the page remains in an outdated login state, then reload it and retry the extension.

For a wider browser-level check, see how to clear cookies and cache in Firefox. Clearing site data logs you out, so confirm the saved login before you proceed.

One site failing while every other site works is almost always a permission or an address mismatch. Fix those two first, and only then start looking at Firefox as a whole.