Extra Semi-colon

1. ImageJ/Memory.java at master · imagej/ImageJ · GitHub

Semi-colon at end of 2’nd if statement creates an empty statement block so the return statement is always executed.

	if (max2>=limit && !IJ.is64Bit()) {
		if (!IJ.showMessageWithCancel(title, 
		"Note: setting the memory limit to a value\n"
		+"greater than "+limit+"MB on a 32-bit system\n"
		+"may cause ImageJ to fail to start. The title of\n"
		+"the Edit>Options>Memory & Threads dialog\n"
		+"box changes to \"Memory (64-bit)\" when ImageJ\n"
		+"is running on a 64-bit version of Java."));
			return;
	}

I think semi-colon should be removed:

		+"is running on a 64-bit version of Java."))
			return;

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2. ImageJ/Editor.java at master · imagej/ImageJ · GitHub

Here also I think semi-colon should be removed:

	if (Menus.getFontSize()!=0) ;
		mb.setFont(Menus.getFont());

should be :

	if (Menus.getFontSize()!=0) 
		mb.setFont(Menus.getFont());

Read the referenced sections in ij/plugin/Memory.java and ij/plugin/frame/Editor.java, checking how each conditional and following statement is intended to behave. Confirm the reported extra semicolons against the surrounding code, then use the project's normal Java validation process to ensure the two affected behaviors remain correct.