Why does Firefox select the last used printer instead of the system default printer on startup?

In the course of using Firefox I selected my color printer to print in color then closed Firefox. When I reopened Firefox later on and sent something to the printer I had assumed it picked up the system default printer, a monochrome laserjet. It picked up the color printer instead. When I restart my other apps they automatically pick up the default printer. Why not Firefox?

Some web pages will pop up the print dialog automatically. In particular, pages that websites have specially formatted for printing may do this.
Are you restoring tabs that you previously opened, or starting up with your home page(s)? I suspect that one of them is generating the dialog. You could check by going to each one and reloading the page to see whether it is from that page.

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Why+does+firefox+open+the+following+tab+file%3A%2F%2F%2FC%3A%2FUsers%2FTom%2FAppData%2FLocal%2FTemp%2Frpc.html

why+does+firefox+open+the+following+tab+file%3A%2F%2F%2FC%3A%2FUsers%2FTom%2FAppData%2FLocal%2FTemp%2Frpc.html

Just delete that file in the temp folder and cleanup that folder.
*file:///C:/Users/Tom/AppData/Local/Temp/rpc.html
See these articles for some suggestions:
* https://support.mozilla.com/kb/Firefox+has+just+updated+tab+shows+each+time+you+start+Firefox
* https://support.mozilla.com/kb/How+to+set+the+home+page - Firefox supports multiple home pages separated by '|' symbols

Why does Firefox remove the URL from the query string?

Hello there,
I've writing a servlet to read data from a file stored on a server. I'm using an HTTP <INPUT TYPE=file > element to locate the file to be read. When I run the servlet using IE as the browser it works fine. When I try running it using Firefox, the path to the file is not included in the query string. The full URL to the file shows up in the file input text field but then mysteriously disappears from the query string. Without the path, the servlet can't locate the file and the servlet fails. How do I get Firefox to include the path in the query string or is there some other workaround for this problem. I want my servlet to work on all types of browsers.
thanks,
grant

Well you may also ask it the other way. Why does Microsoft send the full path file with the input type="file" component?
The purpose of this control is to upload a file from the client to the server. That file is sent with the request.
It does not allow you to browse server files at all. Most probably you are working on your developer machine where the client IS the server, so it works right now.
It won't once they're seperate.
<input type="file"> is the wrong tool to use to browser the server. You need to write your own html pages to do that.
Cheers,
evnafets

Why does firefox crash everytime I use it

Every time I use firefox regardless of what site Im on, it crashes every single time, I do not understand why. I have automatic updates on my computer that update once a week. I had no problems what so ever until Tuesday July 11th, after my computer updated, now I cannot use firefox for any thing. Can you please help, this is very aggravating?

EVERYONE 
Please start your own thread if you have a crash.
# Use this [https://support.mozilla.org/en-US/questions/new/desktop/fix-problems/search?search=Why+does+Firefox+Crash+everytime+I+open+multiple+tabs%3F+%28%2Fquestions%2F968746%29#summarize-question special link] if it is only after multiple tabs are opened. (Look at the related questions some may well have solutions that work for you)
#* otherwise use this quick and direct [https://support.mozilla.org/en-US/questions/new/desktop/fix-problems/form?search=Crashes+Firefox+24+%28%2Fquestions%2F968746%29&step=aaq-question link]
#Please try to post from Firefox (Obviously that may not be possible if it crashes on startup)
# Follow the prompts to provide troubleshooting information whilst you post your question.
# Include a couple of Crash IDs You will need to navigate to''about:crashes'' and look for ID s begim=nningwith '''bp-''' see [[Firefox crashes - Troubleshoot, prevent and get help fixing crashes]]
# Try Firefox in Firefox's safemode
#* see [[Troubleshoot Firefox issues using Safe Mode]]
#* does that help ?
#* If you crash in safe mode please include the crash IDs from a safemode crash
#If you have already posted in this thread, or have crashes after a opening multiple tabs you may wish to post back to confirm you have started a thread so others may see your progress.
ANYONE WITH NORTON SOFTWARE
Someone has already mentioned Norton in this thread. Please note there is a known issue with some Norton software sometimes implicated in Firefox 24 crashes. Norton themselves are asking for more information.
* Please see https://community.norton.com/t5/Norton-Toolbar-Norton-Identity/Firefox-24-still-crashes-when-the-NIS-toolbar-is-enabled/td-p/1023987
* Note Norton forum has Mixed content, you will need to disable Firefox protection when a shield appears in the location bar or you will not see the correct forum navigation. I am sure Norton are aware of this.

Why does Firefox open the printer dialogue box whenever it starts up

When Firefox opens the printer dialogue box automatically opens - why and how do I stop it doing this.
This never used to happen on previous versions of firefox

Some web pages will pop up the print dialog automatically. In particular, pages that websites have specially formatted for printing may do this.
Are you restoring tabs that you previously opened, or starting up with your home page(s)? I suspect that one of them is generating the dialog. You could check by going to each one and reloading the page to see whether it is from that page.

Why does Firefox trigger the UAC warning each time I open it?

I design websites and test them across most browsers. We use Windows 7 operating system, and only Firefox triggers the User Account Control message on our test computers, which is a major annoyance when opening instances of Firefox in rapidfire order as web designers do. Is there a way to disable it? The UAC is not triggered by Opera, Safari, Chrome and we have made sure we have not checked properties-compatibility tab - "Run this program as administrator" in both the Firefox.exe file as well as any desktop shortcuts - as advised by several people and contributors to Firefox forums. But that doesn't have an effect. Each time we test, we get the Windows 7 UAC message. We've written to Microsoft several times and they have not replied. We thought perhaps you'd have a solution that actually works.
Thanks

I reinstalled first without deleting everything and then as you suggested. The program now comes up ok when I log in as administrator. However, it is the only program I have that suddenly won't work as a non-administrator without requesting that the administrator approve it to make changes to my computer. I have looked at the permissions and they are the same as for WordPerfect, for example. I don't expect that this program makes changes to my computer that will bother any other users.
Why does Windows 7 think that Firefox is going to change the computer for other users?

Why does Firefox change the filenames of pdfs when it opens them? They go from normal names to 8-digit random letter/number sequences

When I click to open a PDF from Firefox it behaves very strangely. Instead of opening the PDF with its original filename (say for example: Report_on_the_weather.pdf) it changes the file name on opening. They open up with random 8-digit filenames (for example 5918Bd01.pdf). It does this for all PDF files. I would like to stop this behabviour. Any ideas?
My configuration:
Firefox 4
Windows XP
Adobe Acrobat 8.1 Standard (not the Reader, the full standard application)

cor-el, thanks for responding. As it turns out the machine was compromised, probably due to the Java upgade from 6.x to the supposedly current 7.x version. I suspect one of the 'always open' tabs in my profile was aimed at a site that had been compromised to exploit the java vulnerability that has not apparently been fixed yet.
After removing Java, a current Panda AV scan detected three bad jar files. Further testing with MSCONFIG found a file in startup that did not belong, turns out to be a new exploit with very little coverage on virustotal (neither Panda nor McAfee detected it as malware) but as soon as it was taken out of the startup, Firefox started working perfectly.
Firefox was the parakeet in the cave, tipping over to let me know something was wrong.
The machine is in quarantine until a much more complete analysis is done. We may still rebuild it to be certain.
I'm giving you a 'solved' on this because the windows safe mode boot pointed the way to determining the problem.

Why does Firefox (after the latest update) open an additional tab "What's new"? It causes my laptop to crash, including my "Session restore"

Mozilla Fireox Session Restore fully functioned. However, not after latest update (10.0.2). It takes a lot time to load the (additional tab) page "what's new?" / "Firefox add-ons" after which the script running Session Restore fails.
Only occurs after (re)starting laptop.
How do I remove this addional tab ?
It's irritating.

Hi Murdock_1,
You should look at [https://support.mozilla.com/kb/Firefox+has+just+updated+tab+shows+each+time+you+start+Firefox this article about that specific issue] and the article [http://kb.mozillazine.org/Preferences_not_saved Preferences not saved]. These should give you all the information you need!
If that doesn't work:
# Type about:config in the address bar
# Click ''I'll be careful, I promise'' if prompted
# In the Filter input field type ''startup''
# Double click on startup.homepage_override_url
# Delete the text string and click ''OK''
# Close Firefox and reopen the window to verify that it has worked.
Hopefully this helps!

Why does most of the "system preferences" not load due to having an intel based mac?

I used to be able to access ALL of the items in "system preferences". Since the upgrade to Mavericks, which the Apple Store did for me, I cannot use most of them. It won't load my printer information. I cannot access security and privacy, users and accouts, parental controls, etc. Sometimes a window pops up and says "Preference Error" could not load.....pane. Or it will say "Preference Error" (and something like) cannot load ....... because it's an intel based mac. What the heck does that mean and why does it say that when I used to be able to access everything in the "System Preferences"? Please help! I'm sooooo frustrated and confused right now.

Since the upgrade to Mavericks
In order to get the correct troubleshooting suggestions, please, please pretty please, correct/update your system profile. Thank you
iOS is for mobile devices.

Why is Firefox 10.0.2 using Quicktime instead of AlternaTIFF plug-in?

I have both Quicktime and AlternaTIFF installed. When I go to view a TIFF (e.g., USPTO), attempts to use Quicktime instead of AlternaTIFF. In Firefox's options, both TIF entries, image/tiff and image/x-tiff, specify AlternaTIFF.

You can try to remove (delete) that interfering QT plugin if you do not need any of the other MIME type supported by npqtplugin7.dll 
QT can be very persistent with wanting to handle media files.
See also:
* http://kb.mozillazine.org/Issues_related_to_plugins#Identifying_installed_plugins

Why does Firefox remember the pages I've visited, even though I am using different computers? I've never used the sync function. I don't want my computer at work to be synched with my personal computer at home

My computer at work remembers the pages I've visited even though I visited the pages while I was using my computer at my home. I don't know how or why this is happening, and I don't like that it is in sync with my computer at home - I have never used that function.
For example - When I type in "the methodist hospital" into the search bar using the computer at home, all the search results come up from Google, so I click on the links and take a look around on the websites/pages. The next day, I walk into work, and I type in "the methodist hospital" again in the search bar, and when the results come up - it indicates in gray lettering that "[I] visited this page [yesterday's date]."
Please explain why this is happening and what I must do in order for it to stop. It is scary knowing that my browsing history is remembered using 2 completely different computers. Needless to say, I don't want my boss thinking I'm just surfing the web all day at work.
Thanks in advance!

if i have to read any comment by matt n again i will throw up...in my mouth. i have gone all over google trying to figure out what the f ff did to me without my permission, i have updates turned off so there should be no prompting to restart, there should be a polite offer not a forced update. i am angry and so are a ton of people.
everytime i go to a new complaint, another angry fellow ff user there is matt n with his infuriating smiling little picture...telling me about the awesome safety and security of the new ff...ignoring that a supposed safe but ugly and unusable browser is worse than a customized, beautiful, well functioning browser...with supposed safety issues. i am so angry i cannot express how this has wasted my time. i have been online for 2 hours now figuring out how to fix, apparently i cannot. my old theme is not compatible now...so i am screwed.
good bye. if i wanted chrome i would have had chrome. but i have no choice now.

Why does firefox ignore the exceptions I entered and disallow pop ups from sites that I have listed to be "allowed"

sometimes the pop up blocker allows the exceptions I have listed but most of the time it does not. Is there any way to fix it so that it always allows the exceptions?

It is possible that you run into this pop-up maximum (the default value is 20).
* http://kb.mozillazine.org/dom.popup_maximum
*http://kb.mozillazine.org/about:config
Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do not click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Why does Firefox remove the top portion of my Persona when I'm not showing the Menu Bar?

Under View > Toolbars you can show and hide the Toolbars you want, but when you choose to hide the Menu Bar, it cuts off about a centimeter of my Persona. A centimeter doesn't sound like much but on an image that is only about 10 centimeters tall in the first place, removing one from the top makes the picture unbalanced. Personas that don't have a boarder are even worse because it actually cuts off part of the detail of the image. Could that be fixed in a future patch?

It still chops off the top of the personas :( I think I'll uninstall v8 and go back to v3 Firefox, those were the glory days! haha

Why does Firefox disable the Uninstall button on incompatible and disabled extensions (which should be removed)?

I guess I'm just OCD because I don't want to see a bunch of incompatible and disabled extensions on my list but I can't be the only person who would like to remove them. It seems the obvious choice ... but it is unavailable. Why?

Please don't dodge the question. People have normal adds-ons and extentions that when become incomparable are greyed out and there is no way to uninstall it. Mine is Java at this time. Mine is an extension. I haven't had this enabled since 7 came out apparently I don't need it. So I would like to save space and take the darn thing off the computer. But I can't find a way. Can you please help me? thanks

Why does Firefox display the "Web Gemini" Front page incorrectly?

When the "Web Gemini" front page loads the GAL Logo is in the wrong place.

Reset the page zoom on pages that cause problems: View > Zoom > Reset (Ctrl+0 (zero); Cmd+0 on Mac)
* http://kb.mozillazine.org/Zoom_text_of_web_pages
If you have increased the minimum font size then try the default setting 'none' as a high value can cause issues like you described.
* Tools > Options > Content : Fonts & Colors > Advanced > Minimum Font Size (none)
* Tools > Options > Content : Fonts & Colors > Advanced > [X] "Allow pages to choose their own fonts, instead of my selections above"

Why does Firefox select the last used printer instead of the system default printer on startup?

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