Các câu trả lời gần đây cho Firefox very slow, sluggish and unresponsive on Windows 8.1https://support.mozilla.org/vi/questions/9846662014-07-02T08:05:56-07:00https://support.mozilla.org/en-US/questions/1009133
2014-07-02T08:05:56-07:00kop48https://support.mozilla.org/vi/questions/984666#answer-599378<p><a href="https://support.mozilla.org/en-US/questions/1009133" rel="nofollow">https://support.mozilla.org/en-US/questions/1009133</a>
</p>Hi kop48, does your device also use the DisplayFusion software mentioned in the solution for this th2014-07-02T07:09:21-07:00jscher2000https://support.mozilla.org/vi/questions/984666#answer-599350<p>Hi kop48, does your device also use the DisplayFusion software mentioned in the solution for this thread?
</p><p>If not, could you start a new question at the following link. Scroll down past the suggestions to continue with the form (I think it has 3 different screens). <a href="https://support.mozilla.org/questions/new/desktop/fix-problems" rel="nofollow">https://support.mozilla.org/questions/new/desktop/fix-problems</a>
</p>I'm also seeing horrible performance in Firefox on my Surface and it's driving me crazy. It gets eve2014-07-02T04:45:13-07:00kop48https://support.mozilla.org/vi/questions/984666#answer-599305<p>I'm also seeing horrible performance in Firefox on my Surface and it's driving me crazy. It gets even worse when using Flash. This is also happening on my desktop PC which is far more powerful than this device. Can I provide any info to help troubleshoot this?
</p>Hi mtatters, if you decide you miss Firefox and want to try some new ideas, please start a new quest2014-04-22T01:25:44-07:00jscher2000https://support.mozilla.org/vi/questions/984666#answer-560671<p>Hi mtatters, if you decide you miss Firefox and want to try some new ideas, please start a new question including your system information. There is a link at the top of each page here ("Ask a question").
</p>I've done everything suggested and nothing works.
It's an impossible situation so I no longer use Fi2014-04-22T00:47:19-07:00mtattershttps://support.mozilla.org/vi/questions/984666#answer-560656<p>I've done everything suggested and nothing works.
It's an impossible situation so I no longer use Firefox.
Very disappointing because I really liked it and used it for years.
</p>Figured out what the problem is -- it's a DisplayFusion software that I use for multiple monitor sup2014-01-28T21:59:20-08:00Sythhttps://support.mozilla.org/vi/questions/984666#answer-527595<p>Figured out what the problem is -- it's a DisplayFusion software that I use for multiple monitor support that's causing the issue. I'll just look for an alternative until (if ever) the issue ceases to exist.
</p><p>Thanks for the help.
</p>Hi Syth, it's a useful data point. I wonder whether there is a way to grab a list or snapshot of all2014-01-28T09:07:18-08:00jscher2000https://support.mozilla.org/vi/questions/984666#answer-527408<p>Hi Syth, it's a useful data point. I wonder whether there is a way to grab a list or snapshot of all the active processes in both modes and compare them to see the difference... I'm not very familiar with the tools for that.
</p>See http://www.howtogeek.com/107511/how-to-boot-into-safe-mode-on-windows-8-the-easy-way/
2014-01-28T07:53:29-08:00cor-elhttps://support.mozilla.org/vi/questions/984666#answer-527371<p>See <a href="http://www.howtogeek.com/107511/how-to-boot-into-safe-mode-on-windows-8-the-easy-way/" rel="nofollow">http://www.howtogeek.com/107511/how-to-boot-into-safe-mode-on-windows-8-the-easy-way/</a>
</p>Firefox performs "way" better while running windows in safe mode. All of the problems I've listed ar2014-01-28T07:52:32-08:00Sythhttps://support.mozilla.org/vi/questions/984666#answer-527370<p>Firefox performs "way" better while running windows in safe mode. All of the problems I've listed are gone there. This obviously does not solve the problem, though.
</p>In earlier versions of Windows, it sometimes was useful to restart Windows in "Safe Mode with Networ2014-01-28T07:38:33-08:00jscher2000https://support.mozilla.org/vi/questions/984666#answer-527355<p>In earlier versions of Windows, it sometimes was useful to restart Windows in "Safe Mode with Networking" and test Firefox there. I don't know how that works in Windows 8.1.
</p>This started after I upgraded to an SSD and installed a fresh copy of Win 8.1 (Which is what I was r2014-01-28T07:15:14-08:00Sythhttps://support.mozilla.org/vi/questions/984666#answer-527339<p>This started after I upgraded to an SSD and installed a fresh copy of Win 8.1 (Which is what I was running prior to the upgrade too).
</p>Do you recall the last version of Firefox that ran normally on this system?
Or did the problem start2014-01-28T07:12:56-08:00jscher2000https://support.mozilla.org/vi/questions/984666#answer-527337<p>Do you recall the last version of Firefox that ran normally on this system?
</p><p>Or did the problem start after something else updated, such as Windows, graphics card drivers, security suite?
</p>Alright, resetting had no effect on the performance, unfortunately.
2014-01-28T07:06:11-08:00Sythhttps://support.mozilla.org/vi/questions/984666#answer-527331<p>Alright, resetting had no effect on the performance, unfortunately.
</p>When you use Reset on a regular version of Firefox, your old settings folder is moved to the desktop2014-01-28T06:57:35-08:00jscher2000https://support.mozilla.org/vi/questions/984666#answer-527323<p>When you use Reset on a regular version of Firefox, your old settings folder is moved to the desktop in a folder named Old Firefox Data. But I'm not sure about Nightly; a manual backup sounds like a good idea.
</p><p>You can open your currently active Firefox profile folder using either:
</p>
<ul><li> Help &gt; Troubleshooting Information
</li><li> type or paste about:support in the address bar and press Enter
</li></ul>
<p>In the first table of information, click the button to "Show Folder". This should be everything.
</p><p>For future reference: <a href="/en-US/kb/recovering-important-data-from-an-old-profile" rel="nofollow">Recovering important data from an old profile</a>.
</p>How would I go about backing up everything, including extensions and what not, before trying to rese2014-01-28T06:52:52-08:00Sythhttps://support.mozilla.org/vi/questions/984666#answer-527319<p>How would I go about backing up <em>everything</em>, including extensions and what not, before trying to reset firefox?
</p>No improvement whatsoever. I thought Flash might have been the problem, because of which I tried to 2014-01-28T06:51:44-08:00Sythhttps://support.mozilla.org/vi/questions/984666#answer-527318<p>No improvement whatsoever. I thought Flash might have been the problem, because of which I tried to install an earlier version of it (some people reported their browsers not performing as well with newer versions of flash), but that was of no help either.
</p><p>I'm running the regular Nightly right now.
</p>Although extensions are disabled in Firefox's Safe Mode, plugins are not...
As a diagnostic to see w2014-01-28T06:16:57-08:00jscher2000https://support.mozilla.org/vi/questions/984666#answer-527286<p>Although extensions are disabled in Firefox's Safe Mode, plugins are not...
</p><p>As a diagnostic to see whether Flash might be the culprit, try setting the Shockwave Flash plugin to Click-to-Play ("Ask to Activate"). This will delay Flash from starting on a page until you approve it.
</p><p>To set "Ask to Activate", open the Add-ons page using either:
</p>
<ul><li> Ctrl+Shift+a
</li><li> orange Firefox button (or Tools menu) &gt; Add-ons
</li></ul>
<p>In the left column, click Plugins. Look for "Shockwave Flash" and change "Always Activate" to "Ask to Activate".
</p><p>When you visit a site that wants to use the Flash, you should see a notification icon in the address bar and one of the following: a link in a black rectangle in the page or an infobar sliding down between the toolbar area and the page.
</p><p>Of course, some pages use Flash just for nice advertising or to store/retrieve tracking data on your computer, so you really only need to allow it where there is some media you want to play.
</p><p>Any improvement?
</p>
<hr>
<p>By the way, are you running the regular Nightly or the UX Nightly?
</p>