The most common reasons behind getting the Thunderbird XPCOM error are corrupted Thunderbird installation file, system malfunction, activation of third-party plugin, outdated Thunderbird, and so on. Thus, the best way to fix this error are:
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- First backup the Thunderbird data using BitRecover Thunderbird Backup Tool.
- Once done, uninstall the existing Thunderbird.exe.
- Further, install the latest version of Thunderbird from official website.
- Launch Thunderbird in safe mode.
- Also check that the Window is functioning properly.
With this you can launch and work swiftly with Thunderbird again.
