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Firefox needs a repair at each browser startup. If I don't make a repair, Firefox does not connect with any Internet site

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  • 2 have this problem
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  • Last reply by asquel

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Already tried many things but didn't solve the problem : browser re-start, uninstall/re-install, created a new profile, installed a previous version (50). Ran a complete scan with Trend Micro AV : no malware found. IE runs normally. I am with Vista, Firefox 51.0.1 (32 bits). No idea anymore...

Already tried many things but didn't solve the problem : browser re-start, uninstall/re-install, created a new profile, installed a previous version (50). Ran a complete scan with Trend Micro AV : no malware found. IE runs normally. I am with Vista, Firefox 51.0.1 (32 bits). No idea anymore...

Chosen solution

hi, this sounds like a problem that may be caused by the new multi-process architecture in firefox (codename "e10s"): https://blog.mozilla.org/futurereleases/2016/08/02/whats-next-for-multi-process-firefox/

please try disabling e10s like this: enter about:config into the firefox address bar (confirm the info message in case it shows up) & search for the preference named browser.tabs.remote.autostart.2. double-click it and change its value to false and restart the browser.

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What kind of repair are you talking about?


It is possible that your firewall or other security software 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 install for Firefox and the plugin-container process and the updater process.

See:


Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen or hold down the Shift key) to see if that has effect.

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Sorry for my translation for "réparer" ; I think that in English the correct word is "refresh"; anyway, it is the resetting of Firefox to the factory parameters. Once I do that, Firefox works 100% normally. I tried to re-introduce Firefox as exception in the Windows firewall, but the results were the same. I tried then to start Windows in safe mode. The result was the same, except that I got an error message : "Could not locate the address www.xxxxx on the server", for all Internet sites. One point to mention is that this problem appeared just after the Firefox update to version 51.0.1.

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Chosen Solution

hi, this sounds like a problem that may be caused by the new multi-process architecture in firefox (codename "e10s"): https://blog.mozilla.org/futurereleases/2016/08/02/whats-next-for-multi-process-firefox/

please try disabling e10s like this: enter about:config into the firefox address bar (confirm the info message in case it shows up) & search for the preference named browser.tabs.remote.autostart.2. double-click it and change its value to false and restart the browser.

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Thank you very much ! Without this forum, I would never have found the answer to my problem !