Firefox 30 doesn't load a lot of pages that other browsers do. WHY??

For the last 5 days, Firefox doesn't load pages that other browser on my Mac do. I'm talking about all kind of pages (big .com pages like apple.com/trailers or boingboing or Runkeeper or even Mozilla support pages). I restart it and it does load them, but it doesn't take much time before I get to other that Firefox just doesn't want to open). I reset it, I cleared the cache, I tried all sort of suggested tips and tricks to no avail. In the mean time, all the pages with errors work just fine in Chrome or Safari.

You can open the Web Console (Firefox/Tools > Web Developer) and check on the Network tab if any content is blocked and has a size 0 (zero).
*https://developer.mozilla.org/Tools/Web_Console
You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
*Hold down the Shift key and left-click the Reload button
*Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
*Press "Command + Shift + R" (Mac)

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Firefox cannot load pages that other browsers can, but the 'help' page for this issue did not fix the problem.

I am troubleshooting an issue occurring on a family member's pc. Immediately after changing their "search" settings from "Yahoo search" to "Google search", they found that Firefox was unable to load any webpages. After troubleshooting the problem, I found the "Firefox can't load websites but other browsers can" help page, and attempted each of the solutions listed. None of those solutions fixed the issue. Also, I uninstalled and re-installed Firefox; the issue persists. However, the 'new' version of Firefox remembered the tabs left open when the 'old' version was deleted, so some temporary files likely persisted.
Are there any other steps that can be taken, or is Firefox on this computer no longer an option?

Start with this;
Type '''about:preferences#advanced'''<Enter> in the address bar.
Under '''Advanced,''' Select '''Network.'''
Look for '''Configure How Firefox Connects''' and press the '''Settings''' button.
Check the settings.
Some problems occurs when your Internet security program was set
to trust the previous version of Firefox, but no longer recognizes your
updated version as trusted. Now how to fix the problem: To allow
Firefox to connect to the Internet again;
* Make sure your Internet security software is up-to-date (i.e. you are running the latest version).
* Remove Firefox from your program's list of trusted or recognized programs. For detailed instructions, see
'''[https://support.mozilla.org/en-US/kb/configure-firewalls-so-firefox-can-access-internet Configure firewalls so that Firefox can access the Internet.]''' {web link}
If there is still a problem, go to that computer and do this;
Type '''about:support''' in the address bar and press '''Enter.'''
Under the main banner, press the button; '''Copy Text To Clipboard.'''.
Then in the reply box at the bottom of this page,
do a right click in the box and select '''Paste.'''
This will show us your system details.
'''No Personal Information Is Collected.'''

Newly created images will not display in Firefox 8 for Mac. Same images appear in other browsers. Why?

1. Specific new images are uploaded but will not display in Firefox 8 on my Mac with OS 10.6.8. (Does appear in other browsers, e.g., Chrome and Opera, and appears on Firefox 8 for PC.) Also, other images on the page display.
2. I have cleared cache, cookies, etc., in Recent History, and restarted both application and computer.
3. I've tried creating GIF, JPG and PNG, but none show on the page in Firefox on my Mac. I can see the offending image in other browsers such as Chrome on the same computer, and on Firefox on PC. Offending pages are in both PHP and HTML: http://www.brookfieldcivic.org/advertisers.php and http://www.brookfieldcivic.org/advertising_freedom_montessori.html
Image links: http://www.brookfieldcivic.org/images/advertisers/freedom.png and http://www.brookfieldcivic.org/images/advertisers/Freedom_Montessori_bizcard.jpg

You can use these steps to check if images are blocked:
*Open the web page that has the images missing in a browser tab.
*Click the website favicon ([[Site Identity Button]]) on the left end of the location bar.
*Click the "More Information" button to open the "Page Info" window with the Security tab selected (also accessible via "Tools > Page Info").
*Go to the Media tab of the "Tools > Page Info" window.
*Select the first image link and scroll down through the list with the Down arrow key.
*If an image in the list is grayed and there is a check-mark in the box "Block Images from..." then remove that mark to unblock the images from that domain.

A bunch of ads have been appearing in my firefox browser; when I view the same page with other browsers they do not appear.

I can provide a screenshot to help illustrate my problem. Every page I load has numerous ad boxes embedded into the page from "Ads by Browse to Save". Does anyone else have this problem? Is this something that firefox added to their browser or do I have a malware problem? (I see no option to post a screenshot of the problem, as is advised on the community help homepage. Maybe I will have that option once my question is posted.)

I think I see where it is from your system details:
orange Firefox button (or Tools menu) > Add-ons > Extensions category
If there is no Remove button, then it is an externally added extension and you may need to visit the Windows Control Panel to get rid of it. (But go ahead and at least disable it now.)
Does that work?

Firefox doesn't load/run/start at all.

Firefox doesn't load/run at all. Never had any problems with Firefox before until today.
My spyware warned me about a potential risk of a website asking for permission when browsing on Firefox...I clicked decline. Since then Firefox closed and won't start at all (a load icon begins to appear then nothing else happens. ''' Nothing'''). I don't know if it crashed or not as I didn't receive a crash report (not that I'd be able to access it anyhow I think). It just randomly shut down and since then won't start.
I have restarted my computer, scanned my computer, turned off the firewall, reinstalled Firefox, attempted to run in safemode - none of these options correct the problem. It literally just does not start! It's not running as a hidden process/application either as I've look through my control pannel. Any help would be most appreciated.

Make sure that you allow pages to choose their colors and that you haven't enabled High Contrast in the Accessibility settings.
*Tools > Options > Content : Fonts & Colors > Colors : [X] "Allow pages to choose their own colors, instead of my selections above"
*http://kb.mozillazine.org/Website_colors_are_wrong
*http://kb.mozillazine.org/Websites_look_wrong

Firefox doesn't represent parts of some pages correctly, or doesn't represent parts of some pages at all.

Firefox doesn't represent parts of some pages correctly, or doesn't represent parts of some pages at all. The page [http://osvajalec.si http://osvajalec.si] is not represented correctly. See screenshots: [http://yfrog.com/eumissingxtjx http://yfrog.com/eumissingxtjx] Deleting cookies, disabling Adblock & Noscript and restarting computer/browser didn't help. When I'm not logged in or if i log out, the missing part is not missing. IE is representing the page without problems. :/

You can try these steps in case of issues with web pages:
You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
*Hold down the Shift key and left-click the Reload button
*Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
*Press "Command + Shift + R" (Mac)
Clear the cache and remove cookies only from websites that cause problems.
"Clear the Cache":
*Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"
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
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
You can open the Web Console (Firefox/Tools > Web Developer).
Check on the Network tab if any content is blocked and has a file size 0 (zero).
*https://developer.mozilla.org/Tools/Web_Console

My University email uses outlook and firefox will not let the page open once i log into the university login. It used to work, but now just shows a completely white tab. My email works fine in other browsers. Why?

My University email uses outlook and firefox will not let the page open once i log into the university login. It used to work, but now just shows a completely white tab. My email works fine in other browsers. Why?

Make sure that you haven't left a profiles.ini file.
* http://kb.mozillazine.org/profiles.ini_file
*http://kb.mozillazine.org/Profile_folder_-_Firefox

Firefox will not load certain url's/websites that work in other browsers

Whenever I try to load a website beginning with stk.co (e.g. stks.co/q1CqL ) Firefox gives the following error message:
The HTTP header field "Accept" with value "hc/url;*/*" could not be parsed.
The same URL loads easily in Internet Explorer and other browsers.
How can fix this and/or configure firefox to load this url?
Thanks!

Just for documentation, here's what I see in the Fiddler debugging proxy for this shortened URL:
(1) Firefox requests: http://stks.co/q1CqL
GET http://stks.co/q1CqL HTTP/1.1
Host: stks.co
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
Connection: keep-alive
Response is a 301 redirect with a new address
(2) Firefox requests: http://tinyurl.com/lkef9l2
GET http://tinyurl.com/lkef9l2 HTTP/1.1
Host: tinyurl.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
Connection: keep-alive
Response is a 301 redirect with a new address
(3) Firefox requests http://traderfeed.blogspot.com/2014/12/trading-success-lies-on-other-side-of.html
GET http://traderfeed.blogspot.com/2014/12/trading-success-lies-on-other-side-of.html HTTP/1.1
Host: traderfeed.blogspot.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
Connection: keep-alive
Response is 200 OK with HTML of the page

Viewing iWeb pages in other browsers/platforms

Any known issues with viewing iWeb pages in other browsers like IE (older versions especially) or on a PC platform? I'm ready to build a big but simple family site, but my first test page (jnmobecker.home.comcast.net) is not playing nice. I see it fine on Safari on my Mac, other Macs (at work for instance) see it fine, one friend on a PC sees it fine, others on PCs do not. Specifically, all they can see is the top banner image of the three kids. I did try it on a PC at work today on IE, and I watched as the progress bar loaded 20+ images (the thumbnails and slideshow components I presume) but then nothing but that top bar. Thoughts and any sugggestions are much appreciated, thanks.
Mac Mini Mac OS X (10.4.8)

There are still problems with Firefox and IE: in particular, the font changes. In Safari it looks as it should, but others it reverts to some courier or verdana font.

Firefox doesn't load any page after a while.

I'm having problem with firefox while surfing after a while. For example at first 15 minutes , there is no problem , after a while firefox doesnt load any page , i have to close it and reopen it again to make it work. While firefox is not loading , i can use other browsers as normal. It just doesn't load any page at all but the program itself responds so I can close it with X button.What could be the problem , I'm using latest firefox.

The default of the pref network.http.max-connections has been increased from 30 to 256 in Firefox 6+ versions.
Try to decrease the value of the pref network.http.max-connections from 256 to 30 as used in Firefox 3 versions.
*https://support.mozilla.com/kb/Firefox+never+finishes+loading+certain+websites
See also:
*http://blog.bonardo.net/2011/09/30/is-your-firefor-freezing-at-regular-intervals
*Places Maintenance: https://addons.mozilla.org/firefox/addon/places-maintenance/

After update, firefox doesn't load any site, not even home page. tried older version, same . what's wrong

auto update to FF5. no home page displayed(about blank), won't load any page from bookmarks. I un-installed and re-installed FF3.6. still won't load any web sites, bookmarked, homepage or others typed in. Chrome and IE still work so not connection or PC fault. I have tried changing proxy, and all other suggestions in your help pages, no effect.
HP Pavillion6300UK running Win XP sp3.5 all updates in place, drivers etc up to date.

It seems that '''every'''solution want to begin with "start Firefox in safe mode" and then check your addons/plugins one at a time. This is extremely time consuming and irritating. I'm almost at the point of looking for other browsers.

Firefox doesn't load a page or GIf unless I am moving the mouse

Firefox won't load any page or play a GIF unless I am moving the mouse or typing. I have the latest version of Firefox. It happens every couple of times I use the computer, and the problem keep occuring if I just restart Firefox. Any ideas?

Start Firefox in [[Safe Mode]] to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
* Don't make any changes on the Safe mode start window.
* https://support.mozilla.com/kb/Safe+Mode
* https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

Firefox won't load parts of web pages or let me log into certain websites

I don't quite know how to really explain this, so I'll provide two examples of the problems I'm experiencing:
The first is that, whenever I go onto any of those Wikia sites, Firefox doesn't seem to load anything other than the main page content. By this, I mean that it won't load any "Recently edited/added pages" box or "Recently uploaded images" box on the right hand side of the page, nor will it open the Contents tab to navigate different sections of the main page content itself.
Another problem I'm having is logging in to a website I usually frequent. It uses Facebook, Twitter and/or Google+ to log in, and the site has recently started running on Flash and Silverlight. Up until a few weeks ago, I am unable to log in to this website for the same reason as the example above - it just doesn't seem to load after clicking to log in, yet the rest of the site is fully functional.
In regards to the former example, I did manage to do something with Java that managed to fix it, however when attempting to emulate the solution when it happened again, nothing happened. I'm unsure of what the problem is. Can someone help?

You can try these steps in case of issues with web pages:
You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
*Hold down the Shift key and left-click the Reload button
*Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
*Press "Command + Shift + R" (Mac)
Clear the cache and remove cookies only from websites that cause problems.
"Clear the Cache":
*Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"
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
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
You can open the Web Console (Firefox/Tools > Web Developer).
Check on the Network tab if any content is blocked and has a file size 0 (zero).
*https://developer.mozilla.org/Tools/Web_Console

Firefox won't load BT Yahoo Webmail page

When I try to go to BT Yahoo Webmail (bt.yahoo.com/webmail) I get a page which says 'Unable to connect Firefox can't establish a connection to the server at login.yahoo.com.' - as it would if I were offline. This only happens with Firefox. I can access it ok with Internet Explorer (which I do not wish to use). I also can not access bt.yahoo.com itself.
Also, Mozilla Thunderbird can not access my email (though it has done so with no problems for well over a year). It says 'An error occurred with the POP3 mail server. Mail server mail.btinternet.com responded:' (though it doesn't say how it responded.
The other thing I can't do on Firefox is play the BBC iPlayer (but IE can) and I couldn't access this page on Firefox Support - I'm having to do this in IE.
I have already:
Uninstalled and reinstalled Firefox
Uninstalled and reinstalled Adobe Flash Player
Installed the Active X plugin for Flash Player
Upgraded Zone Alarm (free version)
Upgraded Avast (free version)
(these two have been running for ages and not given problems before)
Shut down both antivirus programmes and tried again.
Checked as many settings as I can find that might be blocking access - though nothing seems obvious.
Read lots of 'help' forums and FAQs.
Drunk more coffee.
Tried it all again, of course remembering to switch it off and on again a few times in between reinstallations and tweaks etc.
Is this a known issue? I am now almost completely insane. Thanks.

I have the same problem can't figure it out, in the meantime I installed IETab and got it to work that way, it's not a permanent solution but for now it's an option

Firefox doesn't show jpg files from a web page while other browsers do

I have created a page and uploaded www.nutechequipments.com/equipment.html page doesn't show the jpg files in only firefox everywhere including Dubai. But all the other browsers show the uploaded jpg pictures in perfect manner. In Firefox only the table is loaded with placeholders. It is not a problem with my computer. It is the problem all over the world.
the sample html code is given below:
<pre><nowiki><td><img src="equip\equip.jpg" size width="110" height="90"></td><td><img src="equip\equip1.jpg" size width="110" height="90"></td><td><img src="equip\equip (2).jpg" size width="110" height="90"></td><td><img src="equip\equip (3).jpg" size width="110" height="90"></td></nowiki></pre>

You have backslashes (\: escaped as %5C as seen in Tools > Page Info > Media) in the scr attribute of the images and that doesn't work in Firefox.
You need to change the backslashes to forward slashes
<pre><nowiki>equip%5Cequip.jpg
equip%5Cequip1.jpg
equip%5Cequip%20(2).jpg
equip%5Cequip%20(3).jpg
equip%5Cequip%20(4).jpg
equip%5Cequip%20(5).jpg
equip%5Cequip%20(6).jpg
equip%5Cequip%20(7).jpg
equip%5Cequip%20(8).jpg
equip%5Cequip%20(9).jpg
equip%5Cequip%20(10).jpg
equip%5Cequip%20(11).jpg
equip%5Cequip%20(12).jpg
equip%5Cequip%20(13).jpg
equip%5Cequip%20(14).jpg
equip%5Cequip%20(15).jpg
equip%5Cequip%20(16).jpg
equip%5Cequip%20(17).jpg
equip%5Cequip%20(18).jpg
equip%5Cequip%20(19).jpg
equip%5Cequip%20(20).jpg
equip%5Cequip%20(21).jpg
equip%5Cequip%20(22).jpg
equip%5Cequip%20(23).jpg
equip%5Cequip%20(24).jpg
equip%5Cequip%20(25).jpg
equip%5Cequip%20(26).jpg
equip%5Cequip%20(27).jpg
equip%5Cequip%20(28).jpg
equip%5Cequip%20(29).jpg
equip%5Cequip%20(30).jpg
equip%5Cequip%20(31).jpg</nowiki></pre>

Firefox 30 doesn't load a lot of pages that other browsers do. WHY??

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