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.

Learn More

Incoming attachments slow to open and videos (YouTube etc.) won't play.

  • 3 replies
  • 1 has this problem
  • 3 views
  • Last reply by Matt

more options

In the last month I have noticed that attachments to emails received are slow to open and most videos like You Tube open but won't play. I get the message "if video doesn't start try restarting your computer" I also have an email account through another provider and am not having the same problem with attachments.

As others have mentioned Thunderbird is slow to open but my desktop computer has also been slow opening other sites of late. Has anyone else noticed that on their computers lately ? Could it be recent updates to Thunderbird or Windows ? I am using Windows 7 pro 64.

In the last month I have noticed that attachments to emails received are slow to open and most videos like You Tube open but won't play. I get the message "if video doesn't start try restarting your computer" I also have an email account through another provider and am not having the same problem with attachments. As others have mentioned Thunderbird is slow to open but my desktop computer has also been slow opening other sites of late. Has anyone else noticed that on their computers lately ? Could it be recent updates to Thunderbird or Windows ? I am using Windows 7 pro 64.

All Replies (3)

more options

The most common cause of a sluggish computer is your choice of anti virus. What are you using?

Note that historically at least, youtube used javascript in the message to display video. Thunderbird does not execute scripts. They are a serious security risk. I might just as easilyl be malware as a video a script downloads.

more options

Using Avast Anti Virus and also have Malware Bytes Premium. Only recent change was my router from internet 300 to 600 with new Shaw's Advanced WiFi Modem (XB6). Everything was working good but recently there were a number of Thunderbird updates and I was wondering if that could be the problem. Incidentally the problem is not only You Tube it is any MP4 video and transfer to another site etc. I am also often getting Fire Fox not responding and Thunderbird not responding.

more options