Some problems with Firefox are caused by extensions, themes or hardware acceleration. This article will help you determine whether one of these is causing your problem and, if it is, describe how to make Firefox run normally again.

Start Firefox in Safe Mode

When you start in Firefox's Safe Mode, all extensions are temporarily disabled, hardware acceleration is turned off and the default theme is used. This will help determine whether one of these is causing your problem.

1. Napsauta valikkopainiketta , napsauta sitten ohjepainiketta Napsauta valikkopainiketta , napsauta Ohje ja valitse Käynnistä uudelleen ilman lisäosia.... Firefox käynnistyy vikasietotilassa.
   Huomaa: Firefox käynnistyy vikasietotilaan myös pitämällä Shift-näppäin pohjassa Firefoxin käynnistyskuvaketta napsautettaessa.pitämällä Option-näppäin pohjassa Firefoxin käynnistyskuvaketta napsautettaessa.suorittamalla Päätteessä komento: firefox -safe-mode
   Pääte saattaa kysyä myös asennussijaintia (esim. /usr/lib/firefox)
2. When the Firefox Safe Mode window appears, press the button Continue in Safe ModeStart in Safe Mode.

After Firefox starts in Safe Mode, test for your problem.

The problem still occurs in Safe Mode

If your problem persists in Safe Mode, it is not being caused by an extension, theme or hardware acceleration. Other possible causes could be plugins or changes made to Firefox preference settings, which are not disabled in Safe Mode.

• For additional troubleshooting suggestions, see Tutki ja korjaa Firefoxin ongelmia, Korjaa liitännäisistä johtuvia yleisiä Firefox-ongelmia, and Reset Firefox preferences to troubleshoot and fix problems.

The problem does not occur in Safe Mode

If your problem did not occur in Safe Mode, it is most likely because of an extension, theme or hardware acceleration. Continue following the steps in this article to determine the cause of your problem.

Turn off hardware acceleration

With some graphics card and graphics driver setups, Firefox may crash or have trouble showing text or objects on pages when using hardware acceleration. You can try turning off hardware acceleration to see if it fixes the problem.

1. Napsauta Valikko-painiketta ja valitse Asetukset.Asetukset.
2. Select the Advanced panel and the General tab.
3. Uncheck Use hardware acceleration when available.

4. Napsauta valikkopainiketta ja napsauta sitten LopetaLopeta

   Napsauta Firefox-valikkoa ja napsauta sitten Sulje. Napsauta Firefox-valikkoa ruudun yläosassa ja napsauta sitten Sulje Firefox.Napsauta Firefox-valikkoa ja napsauta sitten Sulje.

5. Start Firefox the way you normally do.

If the problem is no longer happening, then hardware acceleration was likely the cause. You can try updating your graphics drivers to see if that fixes it or simply run without hardware acceleration. Otherwise, your problem is likely related to extensions or themes. Continue with the steps in this article to see if they help.

Switch to the default theme

If you are using a theme other than the default Firefox theme:

1. Napsauta Valikko-painiketta , napsauta seuraavaksi Lisäosat ja valitse Appearance.
2. Select the default theme, then click the Enable button, to make Firefox switch to that theme.
3. Click Restart Firefox if necessary.

After you restart Firefox, test for your problem. If it no longer occurs, the theme you were using was causing it. If it still occurs, continue following the steps in this article.

Disable all extensions

To determine whether a faulty extension is causing your problem, you can disable all of your installed extensions:

1. Napsauta Valikko-painiketta , napsauta seuraavaksi Lisäosat ja valitse Extensions.
2. Click the name of an extension in the list to select it.
3. Click Disable to disable the selected extension.
4. Repeat this for each of the other extensions in the list.
5. Click Restart Firefox.

After you restart Firefox, all extensions will be disabled. Test for your problem.

If the problem no longer occurs with all extensions disabled, one of your extensions was causing it. To find the extension that was causing your problem, continue as follows:

Test for faulty extensions

To determine which of your disabled extensions was causing your problem, you can re-enable each extension one at a time.

1. Napsauta Valikko-painiketta , napsauta seuraavaksi Lisäosat ja valitse Extensions.
2. Click the name of an extension in the list to select it.
3. Click Enable to enable the selected extension.
4. Click Restart Firefox.

After you restart Firefox, test for your problem. If the problem comes back, the extension you just enabled was causing it.

After you find the extension that was causing your problem, disable or uninstall the faulty extension and re-enable the other extensions in the Add-ons window.

Updating extensions

If an extension was causing your problem, it may have an update available that will fix it:

1. Napsauta Valikko-painiketta , napsauta seuraavaksi Lisäosat ja valitse Extensions.
2. Click Find Updates.
3. If updates are found, install them by clicking Install Updates.
4. When the installation is complete, click Restart Firefox.

After Firefox restarts, your extensions will be updated. If the extension that was causing your problem had an update, re-enable it and test for your problem again.

Checking extension settings

Some problems are caused if the settings of an extension override Firefox settings (e.g. problems with toolbars). Therefore you may want to check the extension's settings to see if you can find the option that is causing your problem:

1. Napsauta Valikko-painiketta , napsauta seuraavaksi Lisäosat ja valitse Extensions.
2. For the extension that is causing your problem click the OptionsPreferences button.
3. Click your way through the settings to see if there is an option that may solve your problem.
4. If you found a suitable option, click Save and Restart Firefox.