Have you tried lowering your tracking protections to see if that fixes the captcha failures?

These articles explain how to turn off the protection:

• https://support.mozilla.org/en-US/kb/total-cookie-protection-and-website-breakage-faq#w_can-i-disable-total-cookie-protection-without-disabling-enhanced-tracking-protection
• https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop#w_what-to-do-if-a-site-seems-broken

Hi,

thanks for the reply. I do always try to turn off the tracking protection if I can't login due to captcha issues.

I don't know what is going on, to be honest. I can access Coursera (an educational website) using Librewolf, as in Librewolf, the captcha comes up, but in firefox it does not.

The other sites seem strange, not sure if it is a site issue or firefox issue. Maybe different sites are using different versions of the google captcha, can't figure out what is going on or how to solve it.

At the moment I have to run mutliple browsers as some sites I simply cannot login to using firefox. The other option I could try is rolling firefox back and try and see if an earlier version of firefox fixes these issues.

Hi Justin:

Thanks for posting about this issue.

I've had similar problems on a few sites I visit on a regular basis since I updated to Firefox v127.0.1 on 19-Jun-2024 on my Win 10 laptop and I suspect that Mozilla has beefed up blocking of third-party cookies and/or trackers in a recent Firefox update. For example, I'm now seeing a variety of problems on the Dell user forum at https://www.dell.com/community/en/categories/dell-community where I am normally prompted to complete a CAPTCHA challenge to sign in, and Dell customer support has confirmed that they've received similar reports from other Firefox users in the past few weeks.

My Firefox is configured to clear my browsing history (cookies, cache, site data, etc.) on exit, disabling all browser extensions and restarting Firefox does not fix the problem, and disabling my Malwarebytes Premium real-time protection also as no effect. Using a Chromium-based browser like MS Edge usually solves the problem.

I'll try NoahSUMO's suggestion <above> to disable Enhanced Tracking Protection on my problem sites and will report back if that helps.

Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.4529 * Firefox v127.0.1 * Microsoft Defender v4.18.24050.7-1.1.24050.5 * Malwarebytes Premium v5.1.5.116-1.0.1252 * Macrium Reflect Free v8.0.7783

Hi Imacri,

thanks for posting, it is helpful to know that I am not the only one with this issue.

I just had this problem on a completely different site when trying to login. Eventually I get the error message along the lines of "Invalid or missing captcha..". I turned off tracking protection, but that made no difference.

I then tried logging in to the exact same site using LibreWolf browser which is based on firefox, and could login without problems.

The next thing I might try is refreshing my profile and, as you have done, try disabling any addons. At the moment, the only addons I have in firefox are Malwarebytes Premium guard and Bitwarden password manager.

Imacri, do you have any of these addons installed? These are Justin's addons that I was curious if could cause these issues. Very curious if Adblock for Firefox can cause issues even while its disabled. But I'm also curious if "I don't care about cookies" or ""User-Agent Switcher" could accidentally cause this. But maybe the obvious suspect could be "Strict Pop-up Blocker". Many years ago, some addons were so powerful they could still cause problems even if they were disabled. So it might be worth looking into uninstalling some of the disabled addons that you're suspicious of. It's a long shot but if you both of you have more addons in common besides Malwarebytes Browser Guard then I might be onto something.

Justin's enabled addons: Bitwarden 2024.6.2 Malwarebytes Browser Guard 2.6.27

Justin's disabled addons: https://addons.mozilla.org/en-US/firefox/addon/adblock-for-firefox/ AdBlock for Firefox "name": "AdBlock \u2014 block ads across the web", "version": "6.3.0",

"name": "I don't care about cookies", "version": "3.5.0",

"name": "IDM Integration Module", "version": "6.42.8.2", "id": "mozilla_cc3@internetdownloadmanager.com"

"name": "Strict Pop-up Blocker", "version": "0.7resigned1",

"name": "ExpressVPN: VPN proxy for a better internet", "version": "6.0.7.6164", "id": "firefox-addon@expressvpn.com"

"name": "Urban VPN proxy", "version": "3.14.0",

"name": "User-Agent Switcher", "version": "1.4.58", "id": "user-agent-switcher@ninetailed.ninja"

Imacri, do you have any of these addons installed?...

Hi NoahSUMO:

Right now I have 5 extensions installed in my Firefox browser:

• Malwarebytes Browser Guard v2.6.27 (enabled)
• Save Page WE v28.11 (enabled)
• Bitdefender TrafficLight v3.2.5 (enabled)
• uBlock Origin v1.58.0 (enabled)
• Video DownloadHelper v9.0.2.12 (disabled)

It looks like Malwarebytes Browser Guard for Firefox is the only extension that Justin and I have in common. Keep in mind, though, that many content blockers like Justin's AdBlock for Firefox and my uBlock Origin for Firefox often use widely available filters lists like EasyList and EasyPrivacy for content blocking so they might actually behave in a similar manner.

However, the fact that the problem still occurs with my Firefox v127.0.2 browser if all my extensions are disabled suggests that a browser extension is not the problem. The fact that my logins work with Microsoft Edge 126.0.2592.68 with Malwarebytes Browser Guard for Chrome v2.6.27 and uBlock Origin for Chrome v1.58.0 both enabled also suggests that some specific security feature built in to Firefox itself might be causing the problem.

FYI, I tried logging in to the Dell forum at https://www.dell.com/community/en/categories/dell-community yesterday with Enhanced Tracking Protection disabled for www.dell.com and I did manage one successful login yesterday, but my test results aren't always reproducible from day to day on that site because Dell is currently making changes to their forum platform and login process. I'm actually in contact with one of the Dell Forum Admins and providing feedback to see if they can figure out why Firefox users are currently having so many problems using the Dell forum. The only good news is that Dell tech support can reproduce most of the problems I've reported if they use a Firefox browser.

I also noticed that the OP Justin has two VPN browser extensions (ExpressVPN, Urban VPN) currently disabled in their Firefox browser. I forgot to mention that I do not use any type of VPN on my system.

Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.4529 * Firefox v127.0.2 * Microsoft Defender v4.18.24050.7-1.1.24050.5 * Malwarebytes Premium v5.1.5.116-1.0.1252 * Macrium Reflect Free v8.0.7783

Hi NoahSUMO and Imacri,

I didn't realise that having an extension, even if disabled, could cause problems. A lot of the extensions I have tried over the years are simply disabled, but not removed/uninstalled.

I will try and remove all the add-ons and see if it fixes the problems. At the moment, the only active extensions I am using in Firefox are Malwarebytes guard and Bitwarden. In LibreWolf, where I have no problems, Bitwarden is also an active add-on, but not Malwarebytes guard.

But just to add to the mystery, yesterday I was able to login to one of the sites that I couldn't login to before due to the captcha not appearing.

So I am at a loss as to why things started working again.

... But just to add to the mystery, yesterday I was able to login to one of the sites that I couldn't login to before due to the captcha not appearing. So I am at a loss as to why things started working again.

Hi Justin:

Firefox v127.0.2 was released on 25-Jun-2024 (release notes available at https://www.mozilla.org/en-US/firefox/releases/). Is it possible that login started working after your Firefox browser was updated to the latest version?

FYI, on my Win 10 machine both Control Panel | Programs | Programs and Features and Settings | Apps | Apps and Features show the "Installed On" date of my Firefox v127.0.2 was 25-Jun-2024, but I ran a manual check for updates at Help | About Firefox as instructed in the support article Update Firefox to the Latest Release instead of waiting for the update to install automatically.

Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.4529 * Firefox v127.0.2 * Microsoft Defender v4.18.24050.7-1.1.24050.5 * Malwarebytes Premium v5.1.5.116-1.0.1252 * Macrium Reflect Free v8.0.7783

Hi Imacri,

it was strange, the login worked yesterday for the first time in ages, yet my firefox only updated to 127.0.2 this evening, so that isn't it.

I have no idea what is going on. I know there were reports that google rolled back captcha due to the issue a while back with firefox so that firefox users could use the captcha. I wonder whether it is site related, meaning I wonder if some sites are using different captcha code, and somehow that is why it seems to break randomly?