How do I disable the default browser check?
Simple as that. I'm running version 61.0.2. There's a checkbox in Options/General/Startup, but changing its state appears to be 100% disabled.
Chosen solution
There is a preference for this that you can adjust behind the scenes:
(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.
(2) In the search box above the list, type or paste shell and pause while the list is filtered
(3) Double-click the browser.shell.checkDefaultBrowser preference to switch the value from true to false
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Would you please take a look at this bug report :
https://bugzilla.mozilla.org/show_bug.cgi?id=1189038
When you scroll down, you'll see :
"Bug 1041516 made it so that when you set Firefox as the default browser, checking for default status on startup also gets set. That's good but we didn't prevent the check on startup setting from being unchecked. So a user can sabotage themselves by opening the options tab and unchecking "Always check if Firefox is your default browser." This will put them in a state where another browser can be set as default without Firefox noticing. We should make this setting unable to be changed when Firefox is the default browser."
Chosen Solution
There is a preference for this that you can adjust behind the scenes:
(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.
(2) In the search box above the list, type or paste shell and pause while the list is filtered
(3) Double-click the browser.shell.checkDefaultBrowser preference to switch the value from true to false
By the way, your Firefox reported you have Flash 28, and the current version is Flash 30. This article has the steps for updating the plugin, if Adobe's auto-updater is not working: Flash Plugin - Keep it up to date and troubleshoot problems.