Comment 5 for bug 299393

First assert(when inserting an address and pressing Enter):

ASSERT: *** Search: _installLocation: engine has no file!
Stack Trace:
0:ENSURE_WARN(false,_installLocation: engine has no file!,2147500037)
1:()
2:()
3:()
4:epsGetAttr([object Object],alias)
5:()
6:SRCH_SVC_getEngineByAlias(http://pastebin.be/14918)
7:getEngineByAlias(http://pastebin.be/14918)
8:getShortcutOrURI(http://pastebin.be/14918,[object Object])
9:canonizeUrl([object MouseEvent],[object Object])
10:handleURLBarCommand([object MouseEvent])
11:onclick([object MouseEvent])

Second assert(opening a page from the URL history):

ASSERT: *** Search: _installLocation: engine has no file!
Stack Trace:
0:ENSURE_WARN(false,_installLocation: engine has no file!,2147500037)
1:()
2:()
3:()
4:epsGetAttr([object Object],alias)
5:()
6:SRCH_SVC_getEngineByAlias(http://mail.google.com/mail/#inbox)
7:getEngineByAlias(http://mail.google.com/mail/#inbox)
8:getShortcutOrURI(http://mail.google.com/mail/#inbox,[object Object])
9:canonizeUrl([object KeyboardEvent],[object Object])
10:handleURLBarCommand([object KeyboardEvent])
11:anonymous(textentered,[object KeyboardEvent])
12:fireEvent(textentered,[object KeyboardEvent])
13:onTextEntered()
14:handleEnter(false)
15:onKeyPress([object KeyboardEvent])
16:onxblkeypress([object KeyboardEvent])

Third assert(opening Firefox):

ASSERT: *** Search: _installLocation: engine has no file!
Stack Trace:
0:ENSURE_WARN(false,_installLocation: engine has no file!,2147500037)
1:()
2:()
3:()
4:epsGetAttr([object Object],hidden)
5:()
6:()
7:currentEngine()
8:get_currentEngine()
9:updateDisplay()
10:init()
11:([object XULElement],11)

That is a restart issue not the same as upstream bug. Removing upstream bug from this bug. Marking as invalid. If you see a different problem please report a separate bug report.