FF can't open tabs on startup

When I start firefox it apologises for not being able to open the previous tabs, perhaps due to one of the tabs that was open before.
But when I tell it to have another go it always succeeds.
So why can't it do it the first time? Is the problem my end or is there a bug?
(FF all versions, Ubuntu 12.04)

Sounds that Firefox has crashed.
*http://kb.mozillazine.org/Firefox_crashes
*https://support.mozilla.org/kb/Firefox+crashes
If you have submitted crash reports then please post the IDs of one or more recent crash reports that have a "bp-" prefix:
*bp-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
You can find the IDs of the submitted crash reports on the about:crashes page.
*You can open the about:crashes page via the location bar, like you open a website, or open the crash reports page via "Help > Troubleshooting Information".
See:
*http://kb.mozillazine.org/Mozilla_Crash_Reporter
*https://support.mozilla.org/kb/Mozilla+Crash+Reporter

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Since installing an icon-editing add-on, I can't open tabs any more / I can only use one tab at a time.

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Oh, wow - look at that, you're right :) I didn't want to uninstall the add-on as I like the feature, but simply by disabling it you can keep the new icons AND use tabs. Thanks dude!
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I've set up Sync on my work PC and my home MacBook.
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First, be sure you're Syncing correctly:
https://support.mozilla.org/en-US/kb/how-do-i-set-up-firefox-sync?esab=a&s=Sync&r=4&as=s
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Regularly closed firefox 36.0.4. and shot down computer (Windows 7 Pro 64-bit).
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I lost about 30 tabs!!
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Think to finish using Firefox forever!!!!!

Don't exit Firefox! Or if you already did, don't start it back up again!
''If Firefox is running:'' Open your current Firefox settings (AKA Firefox profile) folder using either
* "3-bar" menu button > "?" button > Troubleshooting Information
* (menu bar) Help > Troubleshooting Information
* type or paste about:support in the address bar and press Enter
In the first table on the page, click the "Show Folder" button. This should launch a new window listed various files and folders. For best results, change the view to "Details".
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Also, if you return to the main level of the profile folder, you may find some sessionstore files. Copy those to the safe location as well.
Could you report back on what you found?
Note: If Windows hides the .js file extension from you, you can change a setting so that you can see all file extensions (this helps when renaming files). This support article has the steps: http://support.microsoft.com/kb/865219 or http://windows.microsoft.com/en-us/windows/show-hide-file-name-extensions
The kinds of files you may find among your sessionstore-backup files are:
* recovery.js: the windows and tabs in your currently live Firefox session (or, if Firefox is closed, your last session)
* recovery.bak: a backup copy of recovery.js
* previous.js: the windows and tabs in your last Firefox session
* upgrade.js-''build_id'': the windows and tabs in the Firefox session that was live at the time of your last update

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Hi there!
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The problem I'm experiencing is in the sync procedure itself: I can see which tabs I have opened on my PC on both the phone and tablet, but the reverse is only possible by going to about:sync-tabs. The little arrow that should show them (the one with tab-groups) only shows local tabs that are opened. Is there any way in which I can make the tabs appear on my PC without having to go to the about:sync-tabs page?
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I researched through many articles and was unfortunately not able to find a solution to you're problem.
''Have you tried uninstalling Firefox and then reinstalling it on your computer? ''
If not follow the steps below:
'''Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox and any leftover program files and then reinstall Firefox. Please follow these steps one by one:
#Download the latest Desktop version of Firefox from http://www.mozilla.org and save the setup file to your computer.
#After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu) and confirm all upcoming messages.
#Now, uninstall Firefox by following the steps mentioned in the [[Uninstall Firefox from your computer#w_uninstall-firefox|Uninstall Firefox]] article.
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* '''(On 64-bit Windows)''' ''C:\Program Files (x86)\Mozilla Firefox''
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#* On 32-bit Windows, double-click the '''Program Files''' folder to open it.
#* On 64-bit Windows, you will see a "Program Files (x86)" folder AND a "Program Files" folder. Open the '''Program Files (x86)''' folder.
#Look for a '''Mozilla Firefox''' folder. If you find one, right-click it and select ''Delete'' and confirm that you want to move the folder to the Recycle Bin.
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#Double-click the downloaded installation file and go through the steps of the installation wizard.
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Please report back to see if this helped you!'''
'''*Note: test device is currently experiences issues, so I was unable to recreate the issue you are experiencing.*'''

With Tweak Now I choose Compact Mozilla Firefox Database Files, now I can't open tabs, images etc. on websites. I can't get the old setting back, not even by bringing the system back to another date or installing Firefox anew. What to do? Thanks!

This is what I think did happen because I am still able to do those things in Internet Explorer.
E.g. Opening a website I don't see all images, can't use all tabs.
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Please keep your answer simple, I am not that smart...

Not a good idea to use external programs like that to mess with Firefox files, those programs somehow manage to break more than they ever fix. Windows system restore does its' fair share of messing Firefox up, too. And reinstalling Firefox doesn't fix a b0rked Profile, unless you remove it when you uninstall Firefox.
Try a new Profile. 
http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
Then recover specific files from the existing Profile. 
http://support.mozilla.com/en-US/kb/Recovering+important+data+from+an+old+profile

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Hi,
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Turn off IE then return turn on, check if it make any difference (Turn Windows Features on or off)
Install all windows updates (especially for IE11)
Boot your PC into "safe mode with networking" with a limited set of files and drivers as a test in case some conflicts exist in your system.
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Yolanda Zhu
TechNet Community Support

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Try restore as new using computer iTunes.

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In Safari, if you press command (apple key) T a new tab will open up.
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Tony

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I don't use the Ask Toolbar, but earlier today (or yesterday) it was *on* and de-selected it. What else do I have to do to *disable* it?
Also, when I go to safe mode in Firefox, the new tab feature works.

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this slows down my whole computer.

It is possible that your security software (firewall, anti-virus) blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access to internet for Firefox and the plugin-container process and the updater process.
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*https://support.mozilla.org/kb/Server+not+found
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Do you have any tab related extensions (Tools > Add-ons > Extensions) that allow to divert links? 
See [[Troubleshooting extensions and themes]]
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FF can't open tabs on startup

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