The crash report shows a rather high memory usage: System Memory Use Percentage: 83

The linked bug report also indicate an OOM (out-of-memory) issue:

• bug 767343 - crash in nsSupportsStringImpl::SetData with abort message: "###!!! ABORT: OOM: file e:\builds\moz2_slave\m-cen-w32-ntly\build\xpcom\string\src\nsTSubstring.cpp, line 348"

Note that the bug shows a fixed status that has been back ported to the current Firefox 27 beta release, so you could give the Firefox 27.0 beta version a try. This beta version will become the next release in February (Feb 4).

• http://www.mozilla.org/en-US/firefox/channel/

Thank you for your response. Is switching to the new beta release only choice? Is there no way of fixing and keeping this version? Someone told me that Vimeo could've caused it

You can install the beta version alongside of the current release with its own profile.Then you can check out if this helps to avoid the crashes and can still go back the the release version at any time by clicking its desktop shortcut.

You can install multiple Firefox versions via a custom install in different installation folders and keep the current release version installed to be able to fallback to the release version in cases when the beta build isn't working properly.

Make sure not to start Firefox after the installation has finished and use the Profile Manager to create a new (separate) profile for each version.

Use the Profile Manager to create a new profile for this version, so make sure not to start Firefox after the installation has finished.

• https://support.mozilla.com/kb/Custom+installation+of+Firefox+on+Windows

Create a desktop shortcut with -P "profile" appended to the target to launch each Firefox version with its own profile.
The "profile" parameter is the name as seen in the Profile Manager and not the folder name on the hard drive.

• http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
• http://kb.mozillazine.org/Shortcut_to_a_specific_profile
• http://kb.mozillazine.org/Bypassing_the_Profile_Manager