HOw can I prevent Firefox's popups, selling airline tickets, for example, that annoy me and lock up my computer?

I have blocked popups, but Firefox sends me its own, new screens selling things related to what I was looking at, which are reason enough to switch browsers, and they lock up my computer.

Ok you already tried Firefox;s built in popup blocker. Not to surprising that it doesn't work, because writers stop producing code that is going to be blocked.
Blocking popups is much more effective using an extension like "Adblock Plus" with "EasyList (USA)" filter subscription that goes after ads and maybe some bad content as well, but its primary target is ads.
see http://kb.mozillazine.org/Blocking_bad_sites_and_annoyances#Adblock_Plus_extension

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How can I get firefox to remember my user name for accounts that I access frequently?

I always check the box asking do I want firefox to remember my user id so that I do not have to fill it in each time I go online. However, every time I go to these same websites, it never remembers my id. Is there a setting that I am overlooking to prevent this from happening?

* Websites remembering you and automatically log you in is stored in a cookie.
* Create an allow cookie exception (Tools > Options > Privacy > Cookies: Exceptions) to keep such a cookie, especially for secure websites and if cookies expire when Firefox is closed.
* In [[Private Browsing]] mode all cookies are session cookies that expire if that session is ended, so websites won't remember you.
* Do not use [[Clear Recent History]] to clear the "Cookies" and the "Site Preferences"
Clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords.
*[[Cookies]]

How can I prevent Firefox from cleaning my clipboard at exit (exit or closing firefox) ?

How can I prevent Firefox from cleaning my clipboard at exit (exit or closing firefox) ?
I am using FF 9.0.1 and the problem start from FF 5.0

You can't prevent that. 
If you've placed data on the clipboard in Firefox then you need to paste that data in the other program, if that is your intention, before closing Firefox.

How can I prevent Firefox from re-installing test pilot?

I had removed the test pilot extension and its feedback button in Firefox 4.0b9. I let Firefox upgrade itself to 4.0b10 and didn't notice that silently re-installed it.
I was typing in another application when suddenly that window was minimized and the focus shifted to a Firefox "new test pilot study" window that popped up. Even if I had given permission for that software to be installed, that is rude.
I am not willing to trust that if I disable this logging software that it will stay disabled the next time I upgrade. I will remove test pilot again. '''How can I prevent Firefox from re-installing it?'''
One way might be to set extensions.rdf read-only. However, I do not wish to lose the ability to install add-ons, I merely do not want anybody (including Mozilla) to install an add-on without my permission.
https://bugzilla.mozilla.org/show_bug.cgi?id=519357 doesn't seem to address this problem as test pilot is a known component. Its not a plug-in so I can't modify the plugin scanning settings to prevent it from being loaded. Is there some way I can reliably supplement http://www.mozilla.com/en-US/blocklist/ with a local block list file? If so, would I have to update that whenever a new version of test Pilot is released?
http://support.mozilla.com/en-US/kb/Add-ons%20blocklist

I'm not sure what you mean by "re-directs e-mails." Are the recipient addresses changing between the time you address the message and the time it is sent?
If you could provide more information I think that would help in tracking this down.
When you use Firefox to work with your webmail site, whether Yahoo! or Gmail or another, the mechanics of sending the mail are handled by the site itself. So if there is a problem with how messages are addressed, then you may need to check your Yahoo! mail settings.

How can I prevent firefox to Offer to save passwords and how to remove the tick checked when I log in to gmail?

While using firefox I am using, private browsing and not remembering any passwords.
When I login to Gmail, the login page shows option to type in my gmail id and then password, and at the bottom, it gives the option of checkbox to remember the password next time. NOW, the problem is that, THIS CHECK box is always TICKED (Checked). I don't want it to be checked at all.
So How can I prevent firefox to Offer to save passwords and how to remove the tick checked when I log in to gmail?
Thank you so much.

Hi Imran_Afzal, if you know that setting the cookie has no effect after you close your private browsing session, is it really worth finding a hack to clear the checkbox?
I believe in order to do that you would need to use an extension or userscript. However, I haven't searched for one.
''Note: When searching for a userscript on userscripts.org, be very cautious as many hacked scripts have been posted lately. Check reviews and check the code to make sure it only runs on your Google site before installing.''

How can I prevent Firefox from checking whether Adobe Flash is up to date?

I just updated Flash a week ago and already Firefox is prompting me to replace the update with the message "Firefox has prevented the outdated plugin Adobe Flash from running on" (etc.) How can I prevent Firefox (I'm using version 35.0.1) from running this check forever?

"Add-ons" is a mis-leading term, regarding what appears in the Add-ons Manager tab. "Addons" includes Extensions, Search Engines, Themes (Appearance), User Scripts, Styles, and Services - all of which the "Updates" can be controlled by Firefox preferences. "Plugins" are shown in the AOM too, but unlike the others, Firefox has no control over updates for Plugins. As James mentioned, Plugins aren't installed within Firefox as the other categories of "Add-Ons" are - and updates are controlled by the application that installed the Plugin that Firefox uses from each application's own set of folders or wherever in Windows files the Plugin is placed by the installer.
IMO, the biggest problem with Flash is that it is set by default to only look for an update once a month. So when Adobe updates Flash multiple times a month (3 "updates" in January alone) the Flash updater can'r catch each update as it occurs, or even within an acceptable "window of time". A user might "fall behind" as many as 3 new version releases quite easily.
As far as clicking to "Allow" each video when you're behind a version or two with Flash, at least Mozilla does a "soft block" and permits you to "Allow" - a "hard block" would make it impossible to use Flash at all. And "yes". Mozilla ''can do" a "hard block" when necessary.
In conclusion, Flash is a dying technology, which deserves to be buried. It is too "exploitable" by the "bad guys". All the recent "updates" are for security patches for fixing "holes" in Flash and stability fixes to an old application that "has seen better days" (like 10 years ago).
HTML5 Video looks like the future. Use it where you can, like at YouTube which gives you a choice for many videos they host - but you you need to enable that feature in Google preferences or all you're liable got get is Flash videos. With other websites, their users need to tell them that they want HTML5 videos only.

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i use Firefox 22.0 on windows 7
it's about one week that it ask for "Network Connections" when i'm offline and disconnected from the internet even when i don't open a save page and just opening Firefox with a blank page
Image of the Error:
http://home.sums.ac.ir/~rowshansh/firefox.png
http://www.sums.ac.ir/~rowshansh/firefox.png

Did you check the network setting?
Sounds that you have set to connect automatically when a connection is not available.
*http://kb.mozillazine.org/Autoconnect
*http://kb.mozillazine.org/Browser_attempts_to_connect_when_already_connected

How can I open a file in a seperate window. for example how can"D:\asd.doc"

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Check out the Desktop class.
Edited by: pbrockway2 on Aug 23, 2008 2:20 PM
There's a detailed example in Sun's Tutorial.

How can I prevent Firefox from being on top of Thunderbird?

For example, Tbird is open and on top of Firefox, which is open. I click to Forward a message, then address it. Then click to Send. The Forward screen closes and instead of going back to the Tbird messages screen, it goes back to Firefox. How can I stop this from happening?

There has been a change in where Firefox searches for plugins and the plugins folder in the Firefox program folder is no longer scanned for plugins, so Firefox won't find them anymore if they are installed in the plugins folder instead of the "browser\plugins" folder that Firefox now scans.
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You can alternatively move plugins from "<install directory>\plugins\" to "<install directory>\browser\plugins\" (create this folder when missing) to make Firefox find them again.
*http://www.ghacks.net/2013/05/15/why-you-may-have-lost-access-to-plugins-or-extensions-in-firefox-21/
*http://mike.kaply.com/2013/04/24/major-changes-coming-in-firefox-21/
*https://support.mozilla.org/kb/windows-media-or-other-plugins-stopped-working

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I do not wish to start typing my user id for a website and it automatically coming up as a choice since it has been remembered from a previous attempt. How can I delete firefox from remembering it so I just always type it myself?

The [[Form autocomplete]] article has information on deleting saved entries and preventing the browser from remembering form entries in the future.

I do not want to upgrade to 7.0, I am attending online college and the upgraded version does not work with my school. How can I stop Firefox from upgrading? I have to keep uninstalling the upgrade and installing the old one.

How can I stop Firefox from automatically upgrading? My on-line college is not compatible with the upgraded version. I have to keep uninstalling the new one and reinstalling the old one.

It's not a good idea to allow websites to redirect to another site until you know for sure the original site is trustworthy.
But if you still want to do it (again not a good idea).
Tools>Options>Advanced>General - In Accessibility, uncheck "warn me when web sites try to redirect..." option.

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-> [[Uninstalling add-ons]]
* http://kb.mozillazine.org/Uninstalling_add-ons
-> [[Cannot uninstall an add-on]]
-> Uninstalling Toolbars
* http://kb.mozillazine.org/Uninstalling_toolbars
Check and tell if its working.

How can I prevent Firefox from automatically updating?

Hello,
I am trying to prevent Firefox 28 from automatically updating to Firefox 29 (on OSX 10.7.5).
I have the option "Never check for updates" checked under 'Update' in the 'Advanced' Preferences. I have "Automatically update Search Engines" unchecked. I have uninstalled Firefox 29 completely using two separate uninstall clean-up kits and emptied the trash before re-installing Firefox 28... Yet every time I finally re-arrange, customize and re-sync Firefox 28 back to the way I like it, I restart my Mac and Firefox 29 rears it's over-drawn, bubbly, space-wasting, UN-SYNCED, ridiculous tabs on top nonsense user interface.
I've tried to work with Firefox 29 but the new SYNC simply does not work and that's a deal breaker. I need the changes I make on my mac to be reflected across the other two systems on my desk (one WinXP, one Win7) and vice versa. When I try to sync on FF29 it takes me to a page to log in and then refuses to recognize my email and password (which I have thoroughly confirmed on my other systems as correct).
Can you please help me prevent Firefox 28 from automatically updating to Firefox 29?

Thank you for your comments, cor-el.
Yes, I know about Classic Theme Restorer, but the point is what gives Mozilla the right to update my Firefox when I already have quite clearly set every option to prevent automatic updates?
I have set:
app.update.auto - false
app.update.enabled - false
app.update.silent - false
So which secret magic setting has Mozilla used to bypass all these settings and what gives them the right to do it?
Also, moving the tabs bar and menu bar and whatever else has been moved in Firefox 29 is a THEME change. It is not a security fix. Mozilla should not be in the business of changing the theme or look of Firefox. It is not their business how I want my Firefox to look.
Regarding "tabs", I have mine down the left side, so this tweaking of the tab bar position is pointless anyway.
To Mozilla, Just for absolute clarification, there is no way you can possibly justify forcing an update on users computers without their explicit acceptance.
What if someone found out how Mozilla forced the update? They could then force an update that is NOT a genuine Firefox release and do untold damage to peoples' computers.
So now I am forced to delete Firefox from my startup script and start it manually just in case their is another forced update that I can stop.
To cor-el, thank you for your post.
To Mozilla, you have lost the plot.

How can I prevent Firefox automatically updating when first opened on a new CentOS Installation ?

Hi,
I just installed CentOS on a new virtual machine for testing. I need to run Firefox 28 on it.
NO. Don't argue. It needs to be firefox 28.. Yes, I know firefox 35 is out. Yes I know it fixes important vulnerabilities. Yes, I know it has a load of new features. That information won't help me in the slightest. I need Firefox 28 on this virtual machine for a very specific reason, firefox 29, 30, 31, 32, 33, 34 and 35 won't be suitable for this purpose.... The reason I need it is to do with testing a specific website compatibility with older browser versions on multiple operating systems. I am fully aware that the latest version of firefox is the "best"... but it's not what I need right now, so please don't ask questions like "why are you using an older version" or suggest things like "you know, it's really in your best interests to use the latest version"... I get it, OK.... but that's not a helpful reply to this question, because I have a really specific requirement here.
... sorry if that seems rude, I just know what sort of replies get posted here whenever someone suggests using an older browser. I do get why people give such advice. I do understand the benefits of keeping computers that connect to the internet up to date. This particular Virtual Machine won't actually be used to connect to the internet... just to a test website on an intranet.
So the problem I have is that this installation of CentOS 6.4 (x64) comes with Firefox 31. When it first opens, before I have a chance to toggle off update checking, it begins downloading Firefox 35.0.1 and I haven't figured out how to abort the download. I thought about killing the task, but I feared what that might do. So I let it update to Firefox 35 and thought I'd just downgrade it to Firefox 28 afterwards.
I do have the standalone installation of Firefox 28 for linux (firefox-28.0.tar.bz2). I can extract it on the CentOS virtual machine. I thought for my purpose, I could then just run the browser binary.... but it started updating before I could change the option to never check for updates... and there's no option to abort the download there....... sigh...
So I tried editing the file update-setting.ini. I was quite hopeful when I saw it say:
; If you modify this file updates may fail.
; Do not modify this file.
So I changed the setting below to say:
[Settings]
ACCEPTED_MAR_CHANNEL_IDS=dont_update_this_please
hoping that my rather rash change might indeed cause updates to fail :-)
Sadly, it seems that the updates are still happening.
Basically here is what I need on CentOS - A way to run Firefox 28 without it updating to a newer version without asking me first. I don't mind if it keeps asking me... so long as it asks me instead of just doing it without asking.
Just to be clear again - this is for a test configuration I have to build, on a virtual machine. It's OK for this one specific machine to have vulnerabilities, it's OK that it doesn't have all the new features of Firefox 35. It's what I need. It won't be used to browse the internet and go to dangerous web sites that might implant malicious code. It will only be used to connect to a specific web server, behind a corporate firewall, that my company tightly controls. I'm pretty sure doesn't have malware on it (if it does, I have much bigger problems that using an old version of a browser) . Then in a few weeks time, this VM will be deleted, along with the old version of Firefox I hope to have running on it.
Incidentally, I may also have to repeat whatever I'm doing here later on another CentOS VM to install Firefox 27, 26, 25... but I'm hoping I don't have to... but I assume that whatever procedure works for Firefox 28 will work for these other slightly older versions too... don't worry, I don't have to go all the way back to Firefox 1.0... it's not THAT bad :-)
So, with the understanding very clear that normally you would probably recommend just using the latest version.... can anyone help me ?
Thanks in advance.

Firefox tarballs from Mozilla Org use prefs within Firefox for updates. The "toggle" for not automatically updating - '''app.update.enabled''' and where to look for updates - '''app.update.url'''. The first needs to be '''''false''''' and the second could be a '''''null''''' string, do an update can't be found.
''I use both prefs to keep Firefox from updating by itself. I install each new version of Firefox as it is released, and keep the older versions around for reference purposes. Those prefs are the same since Firefox 1.5 came out.''
The versions of Firefox that are part of an operating system installation usually are that OS's own build of Firefox, and don't use the same update setup as Mozilla uses, in most cases. I am not familiar with Cent OS, but Ubuntu and Debian look for Firefox updates and from their own program repository servers outside of Firefox - as with the tarballs from Mozilla.

How can I prevent Firefox from ever automatically updating without my say so. It just did, and DESTROYED all bookmarks. I'm BUMMED about that

There were NO .json files saved anywhere in the 'puter. I need to be reliably OPTED OUT of automatic updating unless the auto destruction forces warn me aforehand to backup my cookies, bookmarks, email and etc. When I now click on Help, I get an automatic start of "downloading Firefox 3.6.6" WHAT KIND OF HELP IS THAT?

Your bookmarkbackups folder is your Profile folder which is normally a folder hidden by Windows.
See:
https://support.mozilla.com/en-US/kb/Lost+Bookmarks#Restoring_bookmark_backups
http://support.mozilla.com/en-US/kb/Profiles#How_to_find_your_profile
http://kb.mozillazine.org/Show_hidden_files_and_folders
Everything indicates that you have Firefox 3.6.3; the current version is Firefox 3.6.6. To check your version at any time, click Help > About Mozilla Firefox.
You can manually check for updates by clicking Help > Check for Updates.
To change your options on Automatic Updates for Firefox: Tools > Options > Advanced > Update
See: http://support.mozilla.com/en-US/kb/Options+window+-+Advanced+panel#Update_tab
I use the "Ask me what I want to do" option. It will still check, but ask you if you want to update '''IF''' you leave the check mark next to Firefox. Un-check Firefox and you run the risk of missing important security updates. With Firefox checked, it should check for updates, by default, once per day.
'''''Other Issues''''': ~~red:You have installed plug-ins with known security issues. You should update them immediately.~~
'''Update Java''': your ver. 1.6.0.17; current ver. 1.6.0.20 (important security update 04-15-2010)
(Firefox 3.6 and above requires Java 1.6.0.10 and above; see: http://support.mozilla.com/en-US/kb/Java-related+issues#Java_does_not_work_in_Firefox_3_6 )
''(Windows users: Do the manual update; very easy.)''
~~red:Check your version here~~: http://www.mozilla.com/en-US/plugincheck/
See: '''[http://support.mozilla.com/en-US/kb/Using+the+Java+plugin+with+Firefox#Updates Updating Java]'''
Do the update with Firefox closed.
'''Update Shockwave for Director''': your ver. 10.1 (~~red:very old~~); current ver. 11.5.7.609 (important security update released 2010-05-11; see http://www.adobe.com/support/security/bulletins/apsb10-12.html)
NOTE: this is not the same as Shockwave Flash; this installs the Shockwave Player.
~~red:Check your version here~~: http://www.mozilla.com/en-US/plugincheck/
SAVE the installer to your hard drive (Desktop is a good place so you can find it). When the download is complete, exit Firefox (File > Exit), locate and double-click in the installer you just downloaded, let the install complete.
IMPORTANT: I have found it wise to always restart your system after doing anything with Adobe products.
See: '''[http://support.mozilla.com/en-US/kb/Using+the+Shockwave+plugin+with+Firefox#_Installing_Shockwave Installing Shockwave]'''
'''You''' ~~red:'''MAY'''~~ '''need to Update Adobe Reader for Firefox''': your ver. N/A; current ver. 9.3.2
~~red:Check your version here~~: http://www.mozilla.com/en-US/plugincheck/
See: http://support.mozilla.com/en-US/kb/Using+the+Adobe+Reader+plugin+with+Firefox#Installing_and_updating_Adobe_Reader
''You may be able to update from the Adobe Reader installed on your system'' instead of going to the Adobe site and downloading. Start > Program Files, find and click Adobe Reader to open, click Help, click Check for Updates.
''If you go to the Adobe site to download the current Adobe Reader:''
-'''use Firefox to download''' and '''SAVE to your hard drive''' (save to Desktop for easy access)
~~red:-See the images at the bottom left of this post to see the steps to take on the Adobe site~~
-exit Firefox (File > Exit)
-check to see that Firefox is completely closed (''Ctrl+Alt+Del, choose Task Manager, click Processes tab, if "firefox.exe" is on the list, right-click "firefox.exe" and choose End process, close the Task Manager window'')
-double-click on the Adobe Reader installer you just downloaded to install/update Adobe Reader
*'''NOTE: On Vista and Windows 7''' you may need to run the plugin installer as Administrator by starting the installer via the right-click context menu if you do not get an UAC prompt to ask for permission to continue (i.e nothing seems to happen). See this: http://vistasupport.mvps.org/run_as_administrator.htm
*'''NOTE for IE:''' Firefox and most other browsers use a Plugin. IE uses an ActiveX version. To install/update the IE ActiveX version, same instructions as above, except use IE to download the ActiveX installer.
*Also see: http://kb.mozillazine.org/Adobe_Reader ~~red:'''''AND'''''~~ [[How do I edit options to add Adobe to the list of allowed sites]]

HOw can I prevent Firefox's popups, selling airline tickets, for example, that annoy me and lock up my computer?

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