We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Rohkem teavet

Firefox 55.0 32bit. SWF files will not run in browser

  • 4 vastust
  • 5 on selline probleem
  • 2 views
  • Viimati vastas Guiltyman

more options

After v55 installed I cannot run SWF files in browser, the first time it asked if I wished to download the file again, since then I just get a blank tab.

Update occured last night, Immediatly I could not use any google owned website as they were showing an untrusted certificate without any option to add exception. Also could not run SWF files.

Have since re-installed firefox, flash player etc. Cleared user profile and done a full clear out of the usual net related detritus. I can now use Google owned sites again (google browser and Youtube) but I still cannot open .SWF files in browser

After v55 installed I cannot run SWF files in browser, the first time it asked if I wished to download the file again, since then I just get a blank tab. Update occured last night, Immediatly I could not use any google owned website as they were showing an untrusted certificate without any option to add exception. Also could not run SWF files. Have since re-installed firefox, flash player etc. Cleared user profile and done a full clear out of the usual net related detritus. I can now use Google owned sites again (google browser and Youtube) but I still cannot open .SWF files in browser

All Replies (4)

more options

What security software do you have?

Just curious: How did you fix the untrusted certificate issue?

You shouldn't have to create an exception in case you did, but investigate the cause and check who issued the certificate.


Did you already update Flash as well to 26.0.0.151?

more options

I'm using Bullguard Premium security and have disabled all aspects of Windows 10 own security.

As for fixing the certificate error on Google and Youtube, I uninstalled firefox cleared registry and internet files. Reset the machine and reinstalled firefox and reset my profile.

I completly removed flash and then installed the latest version

Muudetud Guiltyman poolt

more options
more options

cor-el said

See this article about Bullguard:

Hi cor-el, that isn't actualy the problem, the certificate issue was fixed easily with a fresh install of firefox and clearing my profile. the issue is that firefox now will not open SWF files. Also swf files on a page take longer to load and break when switching tabs.

Flash is up to date and SWFs still open in internet explorer without issue