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Can't upload files in Firefox, using flash uploader. Already reinstalled flash, works ok in Chrome.

  • 2 replies
  • 7 have this problem
  • 4209 views
  • Last reply by guigs

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I have a website where I can upload files to the site's server utilizing Flash - I have the latest Firefox and the latest Flash plugin (uninstalled and reinstalled). But the upload is failing - I only get an "Unknown I/O message. but only in Firefox - Works ok in Chrome. I have already run the Adobe uninstall/reinstall process, and I have also tried running Firefox in Safe Mode and the problem persists.

Chosen solution

Hi Bilinbaja,

I am not sure if you are using FTP to upload the files, however this error can sometimes refer to a hardware issue. Please try to toggle the hardware acceleration by right clicking on a item using the flash plug in and selecting settings.

Please let us know if this improves the performance as well as if this also happens on other computers, or if it still happens after you delete cache and cookies. Each browser has its own cache, Firefox's cache may also be longer. How to clear the Firefox cache 

Did this help? We look forward to your reply.

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All Replies (2)

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Type about:addons in URL and Goto Plugins

  • Check all the plugins are "Always Active"

Somewhere on the page right click, go to view page info > permissions and make sure that adobe flash content is allowed to play on that domain.

Flash in Protected mode occurs issues too

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Chosen Solution

Hi Bilinbaja,

I am not sure if you are using FTP to upload the files, however this error can sometimes refer to a hardware issue. Please try to toggle the hardware acceleration by right clicking on a item using the flash plug in and selecting settings.

Please let us know if this improves the performance as well as if this also happens on other computers, or if it still happens after you delete cache and cookies. Each browser has its own cache, Firefox's cache may also be longer. How to clear the Firefox cache 

Did this help? We look forward to your reply.

Modified by guigs