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typeError: L is not a function appears when i try to select an email to open

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  • Last reply by rem700

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every time I try to open an email, or select one from the list I get typeError: L is not a function message. I have tried the mouse and the mouse pad on my laptop and get the same result. It happens when I left click with the mouse or mouse pad.

every time I try to open an email, or select one from the list I get typeError: L is not a function message. I have tried the mouse and the mouse pad on my laptop and get the same result. It happens when I left click with the mouse or mouse pad.

Chosen solution

This issue can be caused by an extension that isn't working properly.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

  • Do not click the Reset button on the Safe mode start window or otherwise make changes.

If it works in Firefox Safe-mode then disable all extensions (Tools > Add-ons > Extensions) and then try to find which is causing it by enabling one extension at a time until the problem reappears.

Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

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Chosen Solution

This issue can be caused by an extension that isn't working properly.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

  • Do not click the Reset button on the Safe mode start window or otherwise make changes.

If it works in Firefox Safe-mode then disable all extensions (Tools > Add-ons > Extensions) and then try to find which is causing it by enabling one extension at a time until the problem reappears.

Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

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Thanks for your information. My email is working properly again without me doing anything. I really appreciate this forum and your reply. If the problem pops up again, I will have something to try.