JAVA SCRIPT application: Invalid username/password combination. If you continue to get this error, try entering your email address as your username.

Every time I start up Firefox, I get the following:
JavaScript Application
"mfernandez1957" Invalid username/password combination. If you continue to get this error, try entering your email address as your username.
What do I do?
Another issue is hang ups, I mean every few seconds it hangs up and I get (Not Responding), which is frustrating when you're entering data or whatever and in the middle it freezes so then you have to go back and retype stuff that never got entered. It even hangs right out the gate, I get (Not Responding), I mean, before Firefox is even fully loaded, it hangs, it even hangs (though considerably less frequently) with all my plug ins currently disabled. So that's another issue.
If y'all can help, I would be grateful.

hello, please try to [[Reset Firefox – easily fix most problems|reset firefox]] and see if this can address the issue...

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Question
I keep getting this notification when I log in to firefox, "Invalid username/password combination. If you continue to get ... - did not match any documents. I just downloaded the latest version of Firefox and now every time i open it I get the above message having to do with my email. The old firefox didn't do this. There is nothing wrong with my yahoo email or password.

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The email server didn't recognize your username/password combination.

OS: OS X Mavericks
iPhoto: iPhoto v9.5.1 (902.17)
I choose a photo, select Share, select Email, enter an email address to send to and click Send - then I get this error: "The email server didn’t recognize your username/password combination."
In iPhoto preferences I have "Email photos using" set to "iPhoto"; I have an account added for Gmail (outgoing mail server: smtp.gmail.com; Port: 587; User Name and Password are correct for my gmail account, Use SSL is checked - basically everything is default for when I chose to add a gmail account and I'm positive my user name and password are entered correctly). I do not have 2-step verification enable for my gmail account (I've been searching for a solution online and noticed others mentioned this - this does not apply to my situation).
Please help! What is going on? I just want to send an email from iPhoto using my gmail account.
Thanks!

Thanks again for responding, MrHoffman; my responses to your questions are below in italics:
Have you tested the Gmail account via Apple Mail.app, and does both sending and receiving work?
Yes, I have tested the Gmail account via the Apple Mail.app - sending and receiving work just fine.
Have you confirmed that the Gmail user and password work with the Gmail web interface?
Yes, I am sure it is the correct username and password; I am able to access the Gmail account via the Gmail web interface.
Are you aware of and familiar with both sets of credentials present within each account within Mail.app? In particular, have you gotten to the configuration displays the SMTP server settings? (Mail > Preferences > Accounts > Account Information > Outgoing Mail Server (SMTP) > select Edit SMTP Server List > select the SMTP server account > edit the SMTP server settings.)
I'm not sure what you mean by both sets of credentials, but yes, in the Mail.app I have set the Outgoing Mail Server (SMTP) to Gmail (and used the Edit SMTP server list... option to set the smtp server to use default ports, use SSL, and use "Password" authentication (again with my correct username and password for the Gmail account). I also have the Account Information in Mail.app set for the incoming mail server (maybe that's what you mean by both). Either way, I believe having these settings for incoming mail server and outgoing mail server are allowing me to send and receive email for this Gmail account through Mail.app.
I've also had some success by launching Keychain Access.app and finding all passwords associated with the account — specifically and only the Gmail account, in this case — and removing them from your keychain. This does mean you'll have to re-add those passwords — using Mail.app and no other applications — and see if things start working.
I just tried this - I launched Keychain Access.app and removed all entries associated with Gmail. I opened Mail.app, re-entered my password info, and sent a test email to another account - this worked. I opened iPhoto.app, re-entered my password via the Preferences, selected a photo, selected share, selected email, entered a to: address and clicked send - this didn't work (same error message as before (The email server didn't recognize your username/password combination).

Receive the message, "The email server didn't recognize your username/password combination"

I'm using:
Apple OS X Version 10.9.4
iPhoto Version 9.5.1 (902.17)
Processor: 2.3 GHz Intel Core 17
Memory: 8GB 1600 MHz DDR3
500 GB HD
I'm have a problem using the Share command when using my iPhoto software. After selecting a photo and entering the email addresses I press Send and receive the message. "The email server didn’t recognize your username/password combination". I've gone into my iPhone Account Settings and deleted the original account and then re-entered the information into a new account with negative results. I have been using the Share feature for more than a year and have had no problems up until two days ago.
I use MS Outlook and have no problem sending/receiving/forwarding regular emails. Thank you for any help you can afford me.

I've gone into my iPhone Account Settings and deleted the original account and then re-entered the information into a new account with negative results.
You mean, you entered the Account setting again in iPhoto's Preferences?
Then try, if deleting your account password in your Keychain will help.
Quit your mail program. Launch Keychain Access from the "Applications > Utilities" folder and select "Password" in the "Categories" brick. Delete the password for your email account. (right click the email address to bring up the contextual menu and select "delete").

Java script application appearing everytime i open a new tab

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Everytime I open a new tab on my computer, a message pops up with Java script application in a box with a yellow triangle with an exclamation mark symbol. I have to click ok twice before I can continue using the internet.
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hello annap2677, you have quite a few malicious addons present. please try these steps:
# [[Reset Firefox – easily fix most problems|reset firefox]] (this will keep your bookmarks and passwords)
# afterwards go to ''firefox > addons > extensions'' and in case there are still extensions listed there, disable them.
# finally run a full scan of your system with different security tools like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes] and [http://www.bleepingcomputer.com/download/adwcleaner/ adwcleaner] to make sure that adware isn't present in other places of your system as well.
[[Troubleshoot Firefox issues caused by malware]]

JAVA SCRIPT application: Invalid username/password combination. If you continue to get this error, try entering your email address as your username.

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