That's not a phishing attempt. I did a Google search and found some information about this.
I searched a bit the net and found out the menu_HelpPopUp_reportertoolmenu is related to a Reporter add-on that ships with SeaMonkey (who came up with this name anyway?!). The Website Reporter Tool [Help-->Report Broken Web Site] that is used by Netscape and Firefox does not select correctly its language sometimes and cause this error to appear.
Also found here.
Sometimes the Website Reporter Tool [Help-->Report Broken Web Site] does not select its language correctly. If you run across this, switch to another language, then switch back.
There are several things you could try. The first one is changing language, although this seems to apply only if you have any other than English (en-us) as your primary language selection. Go to Tools > Options > Advanced. You'll see Languages on the window - select Choose, change your language selection, highlight the one at the top and click on Move Down, then click ok to exit. I would close Firefox, then re-open it and change it back to the original selection.
Secondly, check your Add-ons - Go to Tools > Add-ons. It will give you a list of Add-ons - you could try disabling any Add-ons you have and see if that makes a difference.
Make sure you have the current updates for Firefox - this appears to be an older problem. Go to Help > Check for Updates.
Let us know if this helps.