Sorry to hear about the crashes. If you are getting the Mozilla Crash Reporter form, your Firefox may have logged some data that would help track down the cause of the problem. You can submit that data to Mozilla and share it with forum volunteers to see whether it points to the solution. Please check the support article "Firefox crashes - asking for support" for steps to get those crash report IDs from the about:crashes page, and then post some of the recent ones here.

Meanwhile, I assume you tested in Firefox's Safe Mode, but if not: That's a standard diagnostic tool to deactivate extensions and some advanced features of Firefox. More info: Diagnose Firefox issues using Troubleshoot Mode.

If Firefox is not running: Hold down the Shift key when starting Firefox.

If Firefox is running: You can restart Firefox in Safe Mode using either:

• "3-bar" menu button > "?" button > Restart with Add-ons Disabled
• Help menu > Restart with Add-ons Disabled

and OK the restart.

Both scenarios: A small dialog should appear. Click "Start in Safe Mode" (not Refresh).

Any less crashy?

Two plugin-related notes, based on what I see in your Question Details > More System Details:

(1) Adobe Acrobat plugin needs to be updated. I recommend using the built-in updater in your Adobe product (Reader or Acrobat): Help menu > Check for updates.

(2) Shockwave Flash missing or disabled. Perhaps you set the Flash player to Never Activate for troubleshooting purposes. If you are having problems specifically with Flash, we can discuss those separately.

Thank you for your fast replies. I updated the Adobe Acrobat plug-in and installed a Shockwave Flash plug-in. Unfortunatelly it still crashes in normal mode, but as I mentioned in Safe mode there are no crashes. Here are some recent crash ID-s:

bp-3dd6cdee-7961-4eb7-8b09-10c912150925 2015.09.25. 22:57 bp-67e5635d-e74e-4638-8f22-2564a2150925 2015.09.25. 22:57 bp-f0817220-a25c-4546-9da9-a10502150925 2015.09.25. 22:30 bp-012b2c6b-ef5b-4968-b7ae-3eef52150925 2015.09.25. 22:08 bp-383b2858-6cc1-465e-9663-2a0152150925 2015.09.25. 20:16 bp-1dba91fd-09a4-4e94-bcd9-4618d2150925 2015.09.25. 20:15

Safe Mode working is an important clue. The crash reports indicate that just before Firefox crashed, it had submitted work to an ATI driver. This combination leads me to suspect that Firefox is not fully compatible with your current graphics card driver software.

As an emergency workaround, you could try disabling Firefox from using hardware acceleration:

"3-bar" menu button (or Tools menu) > Options > Advanced

On the "General" mini-tab, uncheck the box for "Use hardware acceleration when available"

This takes effect the next time you exit Firefox and start it up again.

However, since hardware acceleration improves the appearance of fonts and animations, you may want to check your computer manufacturer's website to see whether any graphics card/chipset driver updates are available for your system. This article suggests safe places to check: Upgrade your graphics drivers to use hardware acceleration and WebGL.

The hardware acceleration thing is already turned off since the beginning , because as soon as I installed Firefox it kept crashing, and it helped that time. I will check the graphics card driver (it is not the recent version, because this is an old computer and could not handle the most recent version). Thanks again for your help, now the solution is almost in my hands.

Hmm, since you mentioned Google Maps, there are a couple other recent features that could be an issue. If you don't find a more sympatico driver, you might try turning them off to see whether they make any difference:

(Warp GL - Firefox 37)

(1) In a new tab, type or paste about:config in the address bar and press Enter. Click the button promising to be careful.

(2) In the search box above the list, type or paste layers and pause while the list is filtered

(3) Double-click the layers.d3d11.disable-warp preference to switch it from false to true

I don't know whether this takes effect immediately or after you exit and start Firefox up again.

(OMTC - Firefox 33)

(1) In a new tab, type or paste about:config in the address bar and press Enter. Click the button promising to be careful.

(2) In the search box above the list, type or paste layers and pause while the list is filtered

(3) Double-click the layers.offmainthreadcomposition.enabled preference to switch it from true to false

I don't know whether this takes effect immediately or after you exit and start Firefox up again.

Note: I read in a bug report a few months ago that turning off OMTC causes problems with the HTML5 player on YouTube, if hardware acceleration is also disabled, so you might also need to force Flash on YouTube if you keep this setting. You can use an add-on for that: https://addons.mozilla.org/firefox/addon/youtube-flash-video-player/

Problem solved (so it seems...). As you said, the problem was with the graphics card driver. I completely uninstalled the driver and all of its folders and files (with the help of a program) and re-installed it. Now the crashes at certain pages from before are disappeared. So thank you for the help.