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LG Nexus 5 appears in my Google 'Your devices' since using Firefox for Android?

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I've noticed on my Google Account 'Your devices' screen (https://myaccount.google.com/device-activity) a rogue device has appeared, an LG Nexus 5. I first thought my account had been compromised, but after changing my password (2FA is on too) and removing the device, it keeps reappearing.

I raised this with Google and they directed me to this thread:

https://support.google.com/accounts/thread/20242885?hl=en

suggesting it's caused by Firefox on my mobile? The timings seem to match, I switched to Firefox in November and this is when this LG appeared.

Any info on what's causing this and if I can stop it?

I've noticed on my Google Account 'Your devices' screen (https://myaccount.google.com/device-activity) a rogue device has appeared, an LG Nexus 5. I first thought my account had been compromised, but after changing my password (2FA is on too) and removing the device, it keeps reappearing. I raised this with Google and they directed me to this thread: https://support.google.com/accounts/thread/20242885?hl=en suggesting it's caused by Firefox on my mobile? The timings seem to match, I switched to Firefox in November and this is when this LG appeared. Any info on what's causing this and if I can stop it?
Attached screenshots

Chosen solution

Firefox Preview gives me...

Mozilla/5.0 (Android 10; Mobile; rv:71.0) Gecko/71.0 Firefox/71.0

An update, since 23rd Jan this issue has gone away. I had a Firefox update around the same time. The Nexus has been replaced by a generic 'Android Device' in Google my devices.

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Additional System Details

Installed Plug-ins

Default theme, uBlock Origin

Application

  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:73.0) Gecko/20100101 Firefox/73.0

More Information

TyDraniu
  • Top 25 Contributor
369 solutions 2055 answers

HI!

Is this device appears on https://accounts.firefox.com/ > Devices & Apps?

HI! Is this device appears on https://accounts.firefox.com/ > Devices & Apps?
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Question owner

Hi.

No, only my expected devices are displayed on the Firefox Device & Apps list.

Hi. No, only my expected devices are displayed on the Firefox Device & Apps list.
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Question owner

Seems pretty conclusive. Just tested it.

  • Have Firefox open on both my Mac and Android, on google.com with my Google account logged in (profile pic top right)
  • Go to https://myaccount.google.com/device-activity and logout the LG Nexus 5.
  • Refresh the Google pages on both my Mac and Android. On the Android my account is now signed out.
  • Log back into Google on my Android.
  • Refresh the Google Device Activity page again, the Nexus is back.

So why would a Google login on Firefox for Android be interpreted by Google as an LG Nexus 5? Very weird.

Seems pretty conclusive. Just tested it. * Have Firefox open on both my Mac and Android, on google.com with my Google account logged in (profile pic top right) * Go to https://myaccount.google.com/device-activity and logout the LG Nexus 5. * Refresh the Google pages on both my Mac and Android. On the Android my account is now signed out. * Log back into Google on my Android. * Refresh the Google Device Activity page again, the Nexus is back. So why would a Google login on Firefox for Android be interpreted by Google as an LG Nexus 5? Very weird.
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TyDraniu
  • Top 25 Contributor
369 solutions 2055 answers

Helpful Reply

Enter "what is my user agent" on google.com page. What does it return?

Enter "what is my user agent" on google.com page. What does it return?
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Question owner

Android Chrome

Mozilla/5.0 (Linux; Android 10; ONEPLUS A6003) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.116 Mobile Safari/537.36

Android Firefox

Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) FxQuantum/68.0 AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.111 Mobile Safari/537.36

I can override this, but then the user agent would be fixed. Not sure why Firefox isn't picking this up?

'''Android Chrome''' Mozilla/5.0 (Linux; Android 10; '''ONEPLUS A6003''') AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.116 Mobile Safari/537.36 '''Android Firefox''' Mozilla/5.0 (Linux; Android 6.0; '''Nexus 5 Build/MRA58N''') FxQuantum/68.0 AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.111 Mobile Safari/537.36 I can override this, but then the user agent would be fixed. Not sure why Firefox isn't picking this up?

Modified by Jamze

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Seburo
  • Top 10 Contributor
  • Moderator
909 solutions 6773 answers

Helpful Reply

Hi

Have you tried this with the new Firefox Preview browser? Does it give the same results?

Hi Have you tried this with the new Firefox Preview browser? Does it give the same results?
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Chosen Solution

Firefox Preview gives me...

Mozilla/5.0 (Android 10; Mobile; rv:71.0) Gecko/71.0 Firefox/71.0

An update, since 23rd Jan this issue has gone away. I had a Firefox update around the same time. The Nexus has been replaced by a generic 'Android Device' in Google my devices.

Firefox Preview gives me... Mozilla/5.0 (Android 10; Mobile; rv:71.0) Gecko/71.0 Firefox/71.0 An update, since 23rd Jan this issue has gone away. I had a Firefox update around the same time. The Nexus has been replaced by a generic 'Android Device' in Google my devices.

Modified by Jamze

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Seburo
  • Top 10 Contributor
  • Moderator
909 solutions 6773 answers

Hi

That look like we may have fixed that issue in Firefox Preview. We are still working in improving Firefox Preview, but you may find that it is a smoother and faster browsing experiance.

Hi That look like we may have fixed that issue in Firefox Preview. We are still working in improving Firefox Preview, but you may find that it is a smoother and faster browsing experiance.
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